Trivia: Daito's personal vehicle in the OASIS is the Mach 5 from Speed Racer. You can see it in the background as he is receiving the Copper Key, and it is also used in the final battle. (00:33:45)
Trivia: Parzival goes on a shopping spree with Aech after he wins the money from finding the first key. As they are walking up to the Holy Hand Grenade in the shop, they walk between 4 different game themed item stands. On the right is Overwatch complete with a hologram of Tracer, and a stand for Dungeons and Dragons. On the left there is a stand for the Borderlands game series complete with the Claptrap robot. Next to that is the Halo stand, showing off a Spartan with various Halo weapons including the MA5D Assault Rifle. (00:29:55)
Trivia: After Wade comes home and is confronted by his aunt's boyfriend who zeroed out "because of your broke ass gloves", he slaps Wade across the face with the gloves and shakes them. If you look closely, you can see the Batman logo on the gloves. Also a few moments later when Wade is pulling his OASIS visor out of his backpack, the logo appears on the side of them. (00:20:35)
Trivia: While Parzival is showing off Aech's shrunken ships to Art3mis, there are some full ships in the background. One of which is Lone Star's RV from Spaceballs seen while Parzival is showing off the ships in the lunchbox. The clearest view of it is when Art3mis fixes Parzival's hair by the Iron Giant's legs. (00:17:20 - 00:20:00)
Trivia: In Aech's workshop, Art3mis quizzes Parzival about his knowledge of Jams Halliday, and she asks him what his favorite shooter is and who he likes playing as. The response is Goldeneye, which was the game that popularized the first person shooter as a genre on consoles. He states that Halliday's favorite character to play as was Odd Job, who is by far the most infamous character to play as in multiplayer on that game. Due to Odd Job's much shorter stature and build than the rest of the characters, it made it very difficult for the auto aim feature in the game to hit him. This gave anybody playing as Odd Job a very very unfair advantage. (00:18:15)
Trivia: After Parzival and Aech take Art3mis to Aech's workshop to fix her bike, she runs up to the torso of the Iron Giant that Aech is building that later plays a big part in the final battle of the movie. The Iron Giant is positioned and stored in the warehouse almost the same way as how in the Iron Giant movie when Dean placed pieces of junk on the Iron Giant and had him sit in his warehouse pretending to be art to trick the military into thinking he was a fake. (00:17:05)
Trivia: During the race after going through China Town, Parsival looks up to see King Kong. King Kong is hanging off the side of the Empire State Building with early biplanes circling around him, recreating the famous scene from the classing King Kong movie. (00:14:55)
Trivia: In the race, Art3mis gets side swiped by a Sixer and skids to a stop as they pass by a movie theater in the city. On the billboard for the theater it shows "Schwarzenegger Jack Slater III". This is a reference to the 1993 film Last Action Hero, where in it Schwarzenegger plays a movie character inside a movie known as the Jack Slater series with the film's protagonist, getting sucked inside the Jack Slater IV film with a magic ticket. The start of the film shows Danny going to see Jack Slater III and the billboard in Ready Player one is nearly identical to the one in the Last Action Hero movie except without the word "is" after Schwarzenegger. (00:14:40)
Trivia: As Parzival is approaching Aech at the race and asks how she got there before him, there is a blue ninja walking behind Aech's monster truck. This is Sub Zero from Mortal Kombat in his latest design from Mortal Kombat X. (00:11:25)
Trivia: When Wade is talking about how when you die in the game, you lose everything you ever worked for, there is one shot of a little girl throwing her OASIS goggles off and screaming in a fit of rage. Behind her on the wall is a poster for the 1982 game, Donkey Kong Junior. Also behind her you can see a blue Care Bear plush toy on her bed, as well as some small Care Bear figurines on the shelf against the wall to the right. (00:06:10)
Trivia: After Wade and Aech identify the artifact on Planet DOOM, the camera pans over a hill as a rocket hits, sending people flying. It keeps panning over and on a ledge you can see the Japanese sumo wrestler from Street Fighter known as E-Honda bashing people off the ledge and striking his famous pose. (00:06:10)
Trivia: On Planet DOOM, Aech kills a guy with an emoji as a head. This guy drops a weapon that Aech then picks up and it's displayed as the EM1-Rail Gun. The EM-1 Rail Gun is the weapon used by U.S. Marshal John Kruger (played by Arnold Schwarzenegger) in the movie Eraser. (00:05:45)
Trivia: Wade asks the computer to locate his friend Aech, and finds that he's on the PvP planet known as Planet Doom. DOOM is the game that popularized the first person shooter genre, following on from Wolfenstein 3D which was the first ever FPS, both made by the company ID Games. (00:05:10)
Trivia: After Wade puts on the face sensor around his neck, he sets down his glasses on a lunch box. This is a He Man Masters of the Universe Lunch Box, complete with its cup next to it. (00:02:55)
Trivia: After buying the Holy Hand Grenade in the shop, Parzival excitedly runs around that display of other items. One such item is the Chucky doll from Child's Play complete with the large kitchen knife iconic to him. This item is also used in the final battle and seen taking out several Sixers just by itself. (00:30:05)
Answer: It's a virtual reality world. Machines can do anything the programmer wants them to.