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)
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.
Answer: It's a virtual reality world. Machines can do anything the programmer wants them to.