Plot hole: In all scenes where special or heavy items are used against the sixers, they are 'zeroed' in waves or circles. This can be seen by their stations turning red in clusters. This makes no sense as the stations have fixed positions, meaning that the sixers would have identical positions in the Oasis and have no freedom or own will to move relative to each other.
Plot hole: During the final battle, we see all the other players charging over the hill and running into battle. We later see that these are just players standing on the streets wearing VR visors. But unlike our hero who is dangling on wires (and used a treadmill earlier on)...nobody on the streets is using any such thing. Which means when they are charging or running, they would all be crashing into walls or any obstacles that get in their way. Certainly nothing like the film.
Character mistake: After Wade is going over the second clue in his mind and trying to figure out what part of Halliday's past is he trying to escape from, he looks over the wall of article clippings and notes he has hung up. When the camera stops on Karen Underwood's obituary, there is a hand written note beside it listing movies set in New York, with the sentence "Set in New York" underlined. This apparently him looking for clues in films set there for the race challenge that is in Manhattan. However, one of the films he has written on that list is Mad Max, which takes place in Australia, not New York. (00:35:00)
Factual error: The third key Easter egg was actually a color-changing flashing pixel in the Atari Adventure game. You had to grab the purple bridge (they looked like outward facing brackets) and go into a box in the lower left corner of the blue maze and move along the bottom left corner. In the movie, it was picked up in the invisible maze. The wall you walk through then flashes along with the pixel, and you may move through it as shown in the movie to see the author's name.
Other mistake: When Helen turns right to "head to the stacks" everyone in the back of the van falls to the right. Centrifugal force would push them to the left. (01:56:06)
Continuity mistake: Right in the beginning, Wade hops out a window from his home and starts walking beside it to the edge to climb to the next level down. As he starts walking he passes by another window with a curtain. It then cuts to a closer angle and suddenly the window no longer has a curtain. Also a wire appears on the wall in front of him. And you can tell it is the same house, not a time jump, as the rust at the top of the window frame is exactly the same. (00:01:15)
Visible crew/equipment: A cameraman can be seen in the side mirror when the van stops to pick up Artemis.
Character mistake: When Wade is trying to figure out the second clue in his van, he scans his bulletin board that has Karen Underwood Morrow's Obituary. The dates show 1975 - 2034 which would make her 59 (or 58) at the time of her death, but the article to the left of the obituary states that she was fifty six years old at the time of her death.
Continuity mistake: As the camera pans over to the box holding the Orb of Osuvox, there is a large yellow weapon with an ammo drum sitting to the right of the box. Under the stock of this weapon is a red piece of metal or glass. When Sorrento bends down to open the box and pull the orb out, this piece of metal or glass vanishes. (00:32:15)
Continuity mistake: The area in front of the race's finish line is different when seen in the first race than when seen the second time as Parzival figures out how to get to it. When the camera zooms in on the Finish Line Gate in the first race, there is a train track or something similar right in front of the gate running parallel to the gate and wall. But as Parzival is driving backwards towards it in the second race, this track is gone, and instead there is a small drive path with small railing along it leading perpendicularly right to the gate. (00:15:40 - 00:27:15)
Audio problem: Parzival starts to walk away from the Office Party recording as Halliday says "Why can't we go backwards for once." Parzival stops and turns around, telling the Curator to stop and go back right as Halliday finishes saying "Really put the pedal to the metal you know?" The Curator then replays that same recording over again. However the timing is off - it is actually two different recordings of the actor saying these lines and not the same message replayed. He says it a full second faster the in the replay. (00:24:55 - 00:25:25)
Continuity mistake: At the end of the race, Parzival is accelerating towards the finish line as fast as he can but King Kong smashes down into the road in front of him. In the first person perspective of Parzival through the windshield of his car, he comes up almost right at King Kong with only 2-3 car lengths maximum between him and Kong. It then cuts to a view of Parzival's face as he reacts, and has time to react before switching camera angles again and now the car much much further away from Kong allowing him time to slam the brakes and skid to a stop from moving at high speeds. (00:15:45)
Continuity mistake: Towards the end of the movie, Halliday shows him the self-destruct button. When the van gets hit, he slams into the wall, almost pressing it. Before the van is hit there are controllers hanging on some wooden hanger right under the button, but when he trips and his hand is on top of the button, the wooden hanger, and the controllers magically disappear. (01:59:35)
Continuity mistake: After using the Cataclyst to wipe out everyone, Sorrento exits his gaming rig, falling to his knees and removes the groin section, handing it to the guy as they walk through the door. Next shot we see Sorrento with the piece back in place. In fact, he runs his hands over it as he walks past.
Continuity mistake: When Parzival, Sho, and Art3mis are in cover before getting to the 3rd challenge, Arty is in trouble and Z shoots her to kill her avatar in game. After he shoots, she drops the controllers, the next shot is of her head with Sorrento coming towards her. On the vest there are 2 blank spots where the controllers are stored; just as Sorrento gets to her, the other guy comes over and gets her up to get back to respawn, and all of a sudden the controllers are in their holder. (01:45:00)
Other mistake: After Wade gets the second clue, he's shown in his little hide away spot looking over a notebook he has wrote in with the words Clue #2, a large number 2 out next to that, and under it in quotes "A creator who hates his own creation" with a hand drawn box around creator. This sentence is highlighted and there is more under it. This is a hand written note on a spiral notebook that he just got after getting the second clue which had only now been revealed. So he sets the notebook in his lap and starts looking over the newspaper clippings and other papers on the wall about Halliday. As the camera pans over, you suddenly see the top of the same paper torn and pinned to the wall. The hand writing is exactly the same, the boxes and figures drawn exactly the same, and is only missing the orange highlights over it. The paper is wrinkled a bit and shows the holes from the spiral as it was torn out and pinned to the wall. But this is impossible as he still has the same paper in his hand, and he only just now got this clue. Somehow a duplicate is on the wall already. (00:34:20)