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.
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)Quantom X
Trivia: In the video that Halliday left behind after his death, you see floral arrangements around his coffin that are in the shape of the Star Trek's Federation symbol and one of the Enterprise. But the really cool thing is his coffin is actually a photon torpedo, exactly like Spock was put in after his death at the end of Star Trek II: The Wrath of Khan. Complete with the blue Federation flag draped over the end of it. (00:08:05)Quantom X