The phone booth Dustin called from at Hawkins High School. Netflix Warning: Spoilers ahead for "Stranger Things" season four, part one. We took a closer look at all the references, callbacks, and compelling details in the new season.   Netflix's sci-fi show includes tons of '80s references and more. In Brenner's crossword puzzle, one of the answers to a clue is "Kali" — the same name as Eleven's "lost sister. "The crossword puzzle Brenner was doing in 1979. Netflix"Stranger Things" season four opens with a flashback to 1979, when Dr. Brenner was still working at the Hawkins National Lab and experimenting on children. Before he heads to work, he times himself with the day's crossword puzzle in the newspaper. One of the clues is "Shiva's wife," referring to the Hindu god. The answer Brenner puts down is "Kali" — the name of a powerful Hindu deity. Kali is also the name of 008, the "lost sister" Eleven found in season two when she briefly ran away to Chicago.  So far Kali hasn't re-entered the story. She wasn't seen in the Hawkins National Lab massacre flashbacks because she had already escaped by the time that happened in the timeline. Given Kali's successful escape, and this Easter egg in the fourth season's opening scene, it feels very possible that she returns into the fold somehow during either part two of season four, or in the show's fifth and final season. Will's historic hero is Alan Turing, the man who revolutionized computer science but was discriminated against because he was gay. Will, Eleven, and Jonathan heading to school together. NetflixThough we never see Will do a presentation, the show gives us a couple of peeks at the poster board he carried to school for his "historic hero" assignment.  Will chose Alan Turing, a man born in 1912 who died by suicide when he was 42 years old.  As the New York Times reported in a belated obituary for the historic figure, Turing was "a British mathematician who has since been acknowledged as one the most innovative and powerful thinkers of the 20th century — sometimes called the progenitor of modern computing. "But "he died as a criminal, having been convicted under Victorian laws as a homosexual and forced to endure chemical castration. "Not only is Will a part of a group of friends who love learning about computers and technology, making Turing a natural icon, but "Stranger Things" has been heavily hinting towards the possibility that Will is gay.  Actor Noah Schnapp told Insider during a recent interview that Will is "facing personal identity crisis a little bit" in this new season. Perhaps he'll finally come out to his friends by the finale. Steve thinks Robin's crush Vickie is also gay because she returned "Fast Times at Ridgemont High" with the movie paused at the exact moment Phoebe Cates' character takes her top off. Steve Harrington loves the 1982 movie "Fast Times at Ridgemont High. "Netflix and UniversalSo far in "Stranger Things," the only character who has come out as gay is Robin. She told Steve, her new platonic BFF, that she likes girls in season three.  Season four opens with Robin and Steve swapping love advice. Steve says that Robin's crush, Vickie, must like girls too because she returned the movie "Fast Times at Ridgemont High" paused at exactly "53 minutes and 5 seconds. "That's the exact moment in the movie when Phoebe Cates' character takes her bikini top off, showing her "boobies" (as Steve puts it). Actress Phoebe Cates was referenced last season as well when Dustin told his friends that his girlfriend Suzie was "hotter than Phoebe Cates. " Also in the season three finale, Steve told the video rental store manager that "Fast Times" is one of his favorite movies. When Dustin calls Steve, there's graffiti on the phone booth that references "E. T. " — one of the many seminal '80s movies that inspired "Stranger Things. "The phone booth Dustin called from at Hawkins High School. Netflix"Stranger Things" creators Matt and Ross Duffer have described the show as a love letter to the '80s. The series often includes meta-references to the sci-fi movies that inspired the story. The phone booth graffiti says "E. T. phone home" — a line from Steven Spielberg's 1982 movie "E. T. "The first season of "Stranger Things" held many clear parallels to the seminal story about a young boy who discovers an alien and decides to help him, including the scene where the boys dressed Eleven up in a wig and helped her escape the Hawkins Lab people on their bikes. There's a Freddy Krueger cut-out in the video store. Robert Englund, the actor who played Freddy in "Nightmare on Elm Street," plays Victor Creel in the new season. The Freddy Krueger cut out at the rental store where Steve and Robin work. NetflixThe first "Nightmare on Elm Street" movie premiered in 1984, bringing the world a haunting horror villain named Freddy Krueger. In the movie series, Krueger haunts and kills his victims from inside their dreams. Vecna, the new villain of "Stranger Things 4," has many parallels to Kruger, including his disfigured face and ability to infiltrate the minds of his victims.  The Duffer Brothers also took care to include an even more meta reference to "Nightmare on Elm Street" by casting the original Freddy Krueger actor (Robert Englund, now 74 years old) to play Victor Creel in the new season. Erica is wearing an American flag when we see her for the first time in "Stranger Things" season four, a likely nod to her iconic line: "You can't spell American without Erica. "Dustin, Erica, and Mike walking down the hallway. NetflixErica is once again brought into the fold this year, making her the youngest of the kids who have had to save Hawkins again and again.  Last season, it was Dustin, Steve, and Robin who needed her help. She negotiated free ice cream in exchange for helping infiltrate the Russian base underneath Starcourt Mall. That was the moment when she delivered her memorable motto, the thrust of which she still carries in season four as she charges into the Hellfire Club wearing an American flag as a cape. When Dustin tells his Hellfire buddies to never "tell him the odds," he's referencing "Star Wars. "Dustin speaking at the Hellfire Club. NetflixIn "Star Wars: Episode V — The Empire Strikes Back," Han Solo steers the Millennium Falcon into an asteroid field in order to escape some tie fighters. When C-3PO tries to tell him the chances of survival, Han simply replies by saying: "Never tell me the odds. "This isn't the first time the Duffer Brothers have included an homage to Han Solo. "Star Wars: Episode V — The Empire Strikes Back. "DisneyAfter the season three finale, where Hopper was believed to be dead, the Duffers said in an interview that Hopper's story was analogous to Han Solo's arc between "The Empire Strikes Back" and "Return of the Jedi. "Han was encased in carbonite and had to be rescued by Leia, much like Hopper being believed dead and then rescued by Joyce in "Stranger Things 4. "The clock chime that signals Vecna's presence was first heard when the Mind Flayer (who we now can assume was really Vecna) possessed Billy. Chrissy in season four of "Stranger Things. "NetflixIn the opening episode of "Stranger Things" season four, a new character named Chrissy hears and sees a spooky clock in the days leading up to her death. Though the kids think Vecna is some new threat, the seventh episode ("The Massacre at Hawkins Lab") reveals that Vecna's real name is Henry Creel, and he was the first child to be experimented upon at Hawkins Lab — making him "001. "Knowing now that Vecna has been the puppeteer of everything in the Upside Down that's been attacking Eleven and her friends, you can see hints of his presence in earlier seasons. The clock chime noise heard throughout season four was actually first heard in season three, episode two. The chiming began when Billy was psychically transported to the Upside Down after being possessed by the Mind Flayer. But now, with all the revelations in season four, we know the Mind Flayer was really just another tool Vecna was using to find and kill Eleven. In episode two, we see that the phone lines in Hawkins are still being monitored by the government. The people who have tapped into Hawkins' phone lines. NetflixWe saw this phone-listening station multiple times in the first season, where people recording calls made in Hawkins were identifying suspicious circumstances connected to the Upside Down. This time around, someone is listening to the new police chief, Powell, when he calls someone for help figuring out how Chrissy died in such a gruesome manner. Mike comes to Lenora on Will's birthday. But nobody on the show (not even Jonathan or Joyce) tell him "Happy Birthday. "Mike, Eleven, and Will at the Lenora Airport. NetflixIn season two, when she's trying to get him un-possessed by the Mind Flayer, Joyce mentioned that Will's birthday is on March 22. Then in the first episode of season four, the location card says it's March 21, 1986. The characters discuss that Mike is heading to California the next day — which means he arrived on Will's birthday. But for unexplained reasons, not a single character seems to know. Is this just a slip-up in the show's details? Or is Will really being so neglected by his friends and family that they all forgot about his birthday?The hangout at Benny's restaurant includes a reminder of the diner owner's gruesome murder in season one. Benny in season one and a random teen in season four. NetflixIn season four, episode two, we see that Lucas and the basketball team celebrated their win with a party at Benny's Diner — the first place Eleven went when she escaped Hawkins National Lab (HNL).  Back in the very first episode of "Stranger Things," Benny was killed by a woman working for Brenner. She then staged the murder to look like a death by suicide. Benny's death was one of the most tragic and direct acts of violence we saw in the show.  Seeing his diner now trashed and filled with drunk teenagers really hammers home how much has changed since that pilot episode.  Eddie Munson's uncle tells Nancy that Victor Creel is at Pennhurst Asylum — the place Lucas thought Eleven had escaped from in season one. Eddie Munson's uncle. NetflixBack when Lucas, Dustin, and Mike had first met Eleven (in season one, episode two), Lucas was the one positing a theory that she was a "weirdo" who had escaped "from Pennhurst. "All these years later, Pennhurst came back into the story as the asylum where Victor Creel has been living ever since his arrest for the murder of his family. Eleven signs her note to Mike with "from" — a clue that she's withholding her feelings from him because she's still hurt. The note Eleven wrote to Mike before going to the "NINA" project. NetflixAfter Mike, Will, and Jonathan learn about Eleven's secret mission to regain her powers, the government officials working for Dr. Owens hand Mike a note from El. They don't know if they can trust random government officials because they've already been so burned by corruption and cruelty within the system of the US government. Mike literally went from trying to outrun vans full of Department of Energy employees to being trusted with a secret, highly classified note by an anonymous government employee working for a secret faction of the Pentagon.  The emotion of this scene is driven home when Mike sees the note is signed "from" instead of "love. " Eleven is pulling away from Mike after his refusal to say "I love you" to her again. Now she's resolute on healing herself. Nancy's fake resume says she was a "youth worker" in the years she spent helping her little brother and his friends save the world. The fake resume. NetflixThe years listed for this experience are 1985 and 1986, which covers the last two years Nancy spent with her younger friends saving the world from the Mind Flayer. "Working with teens" is a rather cheeky way of summarizing how Nancy's real-world experience could translate to a college resume. Hopper and Dmitri reference a 1963 movie called "The Great Escape" while talking about Hop's "cool cat" demeanor. Tom Wlaschiha plays Dmitri Antonov in "Stranger Things" season four. NetflixIn the movie, the character played by Steve McQueen (Captain Virgil Hilts, aka "The Cooler King") ends up right back in the very prison he engineered an escape from, ready to plot the next attempt.  This is an early hint at the result of Hopper's escape — he made it all the way to a blissful meal of peanut butter in a church, but then was caught and hauled back to the starting point. Now he, Joyce, Murray, and Dmitri are going to have to try and escape once again. The flashback to Eleven's attempted escape shows her running down a familiar flight of stairs. We've seen Hopper in this exact stairwell during his own flashbacks. The staircase Eleven ran down in her 1979 memory. NetflixEver since season two of "Stranger Things," we've theorized that there is a likely connection between Hopper's first daughter's death and the Hawkins National Lab. One of the biggest hints that supports this theory is the recognizable stairwell (seen above) that we know is inside the HNL building. Hopper and Dr. Owens have both been shown in this stairwell, and David Harbour himself hinted at a link between the hospital where Sara died and the lab. Both Hopper and Dr. Owens in a similar-looking stairwell on "Stranger Things. "NetflixAs seen above, Hopper was in that same stairwell when he was grieving over his daughter's death in a hospital room. Does that mean Sara died inside HNL? This season we got the reveal that Hopper believes Sara got sick and died because he, Hopper, had been exposed to the chemical weapon Agent Orange. He told Dmitri he was just a teenager when he got drafted and told to work with the deadly substance.  So now Hopper believes that Sara died due to birth defects related to Agent Orange. But why would that have landed her in the secret hospital lab in Hawkins? Insider asked Harbour back in 2017 if he could tell us more about this connection between Sara's hospital room and the HNL. "Hmmmm [laughing] I can not," Harbour said. "But yes, it is the same location. So that's interesting. Or it's a similar location. But there's actually another thing you'll notice which is that there's a stuffed animal lion that appears in Eleven's room when he breaks into the lab and finds that room, and it also appears in Castle Byers, and it also appears on Sara's lap. "For a full breakdown of all the connections between Hopper, his daughter Sara, and Eleven, read our full report here.  This season also finally confirmed how Eleven was able to escape from HNL in 1983. The storm drain in season four and season one. NetflixWe see Henry (aka "001," aka Vecna) show Eleven the entrance to a storm drain that will take her outside the boundary of