I've seen a few articles that have a list of “all the Easter Eggs” but aren't even close. Here's an attempt to catalog as many as possible

• Jump by Van Halen playing
• In Wade's hideout there's a Nintendo lunchbox (haven't managed to catch the game)
• There's also a crushed Carl's Jr cup
• There's a bunch of stickers near these but I've only made out the Oasis sticker so far
• Entering the Oasis, we first see Minecraft World
• Henry and Em's house from The Wizard of Oz in Hurricane World
• 1989 Batman climbing on Everest
• Planet Ludis flashes by, a reference from the book which is otherwise completely absent from the movie
• DC's The Flash
• Ray Harryhausen Cyclops from the 7th Voyage of Sinbad
• Borg? (off to the left of the cyclops)
• BattleToads?
• RoboCop
• Marvin the Martian
• Mortal Combat guy? Can't figure this one out - right before Parzival changes his hair
• Sonic the Hedgehog lining up for the gate
• Tracer from Overwatch
• Hello Kitty, Badte-Maru, and Keroppi
• First zooming in on Planet Doom, it looks like a battle between giant scorpions and pegasai possibly from Clash of the Titans?
• Freddy Kruger
• Duke Nukem
• Some kind of Smiley Face guy
• EM-1 Rail Gun from Eraser
• Blob?
• Raynor from StarCraft
• Donkey Kong Jr poster on the wall behind the girl
• Jason Voorhees
• Everybody Wants to Rule the World by Tears for Fears
• World of Warcraft female orc?
• There's a guy behind the orc that looks like one of the Daft Punk guys but he turns his head and looks like a skull with a helmet on
• Doc Brown
• Movie note: 1972 is the mint date on the quarter in focus on Halliday's eyes and is also Halliday's birthday. The quarters in the book were minted in 1984 but no reason is given for this date.
• In the funeral scene, Halliday is wearing a Simon pin
• Halliday's funeral is a Star Trek themed funeral
• Halliday's casket is a MkII photon torpedo from Star Trek II which is draped with a flag of the Federation of Planets similar to how Spock's casket appeared in the same movie.
• Halliday sits up in his casket - this seems to mimic Dracula sitting up in his coffin in the old Beli Lugosi Dracula movies but I can't find a reference

• I Hate Myself for Loving You by Joan Jett and the Blackhearts playing
• Mad Max's car
• Batman 60s TV series car
• Speed Racer's Mach 5
• Ryu from Street Fighter?
• Car from Christine?
• Movie note: Nolan is such a dick, his tie has “NS IOI” on it, his name and his company
• Aech's truck is a modified Bigfoot 3 (the monster truck) from 1984
• Parzival's car is the original (pre-future mods) Delorian time machine from Back to the Future but has KITT's “eye” on the front, mentioned in the book, only seen in the movie
• Art3mis' motorcycle is Kaneda's bike from AKIRA
• Movie note: the race is a race to Central Park
• Is the Formula One race car a reference?
• The A-Team's van is seen briefly
• Sho is driving a black Trans-Am, possibly Smokey and the Bandit?
• The semi that comes from a side street and blocks the race is The Porkchop Express, Jack Burton's truck from Big Trouble in Little China
• Movie marquee advertises “Schwarzenegger [as] Jack Slater” which is the in-movie fictional hero in Last Action Hero
• Tyrannosaurus Rex likely from Jurassic Park
• King Kong is hanging onto the top of the Empire State Building, classic scene from many of the older King Kong movies, while being buzzed by planes
• The Silvercup Studios sign - references are too many to list here

• Pee-wee's bike from Pee-wee's Big Adventure
• Iron Giant from the movie of the same name
• The Galactica from Battlestar Galactica
• Sulaco from Aliens
• Valley Forge from Silent Running
• The TARDIS
• Parzival mentions a Harkonnen dropship that can fold space (?) from Dune
• Eagle-5, Lone Starr's RV spaceship from Spaceballs
• The EVA pod from 2001: A Space Odyssey
• A Viper fighter from Battlestar Galactica
• Goldeneye videogame
• Hot Pockets
• A quote from the Superman movie
• Art3mis calls Parzival “McFly” before she disconnects, another reference to Back to the Future and possibly channeling Biff?

• Faith by George Michael playing
• Galaga? Galaxian? poster on the wall of the cafeteria
• Halliday wearing a Space Invaders t-shirt
• Parzival wearing what looks like a Han Solo gun belt with a ThunderCats logo on the buckle
• Parzival wears black Canvas Hightops sneakers
• I can't find a reference for the sword on the back of his denim vest - possibly just a reference to his namesake knight?

• Zemeckis Cube: this one is a twofer; Robert Zemeckis wrote and directed Back to the Future and was involved in the story and directed the other two movies in that series. The Cube is a reference to the Rubik's Cube, a 3-dimensional puzzle game that debuted in the 80s.
• Goro from Mortal Combat
• Chestburster alien from Alien
• Clark Kent, secret identity of Superman; it's a reference to the dubious premise that he takes of the Superman suit and puts on glasses and no one recognizes him

• Perseus' shield from Clash of the Titans, 1981 version

• Wade is wearing the suit Buckaroo Banzai wears in the movie The Adventures of Buckaroo Banzai Across the 8th Dimension
• Staying Alive from movie of same name playing
• Ate3mis' rifle is an Armat M41A Pulse rifle from Aliens

Many of these references are explained in the scene

• TAB soda produced by Coke Company but not widely available anymore
• Robotron video game