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.
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