1. Eleven has a couple of the Polaroid photos Mike's mom took of him last Halloween — one is framed on her desk...
2. ...which she moves over to her bedside table later on in the season, after they've ~broken up~.
3. And there's another one tucked into her bedroom mirror frame.
4. She also has the mask she wore with Kali's gang (in Season 2) hanging on her wall.
5. And the giant bird poster she has on her wall is from Mike's basement.
6. Jonathan falling over while pulling on his pants is a direct nod to this classic moment in Back to the Future.
7. And, speaking of Back to the Future, the Scoop Troop sneak into the movie theater just in time to see Marty use the same JVC camcorder that Bob also had in Season 2.
8. One of the inventions Dustin brings home from summer camp is an electric hammer called, "The Slammer," which is just like the invention Mr. Peltzer (the dad) makes in Gremlins .
9. And much later on in the season, in Episode 7, a clown walks by Alexei holding a Gremlin toy.
10. This one is pretty in your face, but just in case you missed it, Dustin's using the famous Farrah Fawcett hairspray Steve recommended last season.
11. Mrs. Wheeler is reading ANOTHER Johanna Lindsey romance novel with a Photoshopped cover that looks like Billy.
13. The cash register at Scoops Ahoy in Episode 2 says "E02."
14. One of the people protesting Starcourt Mall has a sign saying, "The pretzels aren't even that good!," which is just super funny.
15. The "39 Still in Beirut, Awaiting Release" article seen on the Hawkins Post newspaper was a real news story in 1985 about hijacked flight TWA 847.
16. The song Mr. Clarke is listening to in his garage is "Weird Al" Yankovic's "My Bologna," a parody of the song "My Sharona" by The Knack.
17. There are a lot of visual nods to iconic action films, like Erica crawling through the vents à la Die Hard...
18. ...Grigori carrying himself like the Terminator...
19. ...and the Mind Flayer getting all up in Nancy's face like in Alien 3.
20. The guy Hop, Joyce, and Alexei steal a car from is credited specifically as "Rich Douchebag Todd" LOL.
21. The Hawkins Memorial Hospital logo is an homage to the Haddonfield Memorial Hospital logo in Halloween II.
22. The red door and "1438" street number at the Holloway's house is a reference to A Nightmare on Elm Street.
23. Eleven and Hopper's hands are sweetly entwined with the infamous blue hairband-turned-bracelet here that Hop gave her last season.
24. Suzie has Dustin's old red, white, and blue hat on her nightstand.
25. There are also a bunch of nods to the Stranger Things crew in all the newspaper clippings in the epilogue. Like this one that quotes a "local townsperson" Dean Zimmerman, who is actually the show's editor...
26. ...this "Hero Chief Dies in Fire" story by Caitlin Schneiderhan, the Duffer Brothers' assistant...
27. ...this Indiana Chronicle story by Brad Tobler, a VFX editor on the show...
28. ...and this Journal Tribune clipping that notes Andrea Knoll, the visual effects co-producer, and Caleb Heymann, one of the show's directors of photography.
29. And finally, on moving day, Eleven wears the flannel shirt she got from Hop in Season 2 that reminded her of home (and the people she loves) when she was running around with Kali's gang.
