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
• Nintendo lunchbox
• Carl's Jr cup
• Minecraft World
• Henry and Em's house from The Wizard of Oz in Hurricane World
• 1989 Batman on Everest
• Ludis, 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 Vorhees
• Everybody Wants to Rule the World by Tears for Fears
• World of Warcraft female orc?
• One of the Daft Punk guys
• Doc Brown
• Neat note: 1972 is the 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

• 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