Factual error: When Bruce Willis is looking at his old high school news clippings you see a professional baseball score on one of the newspaper clippings. The game was Pittsburgh vs. Arizona Diamondbacks. The Diamondbacks were not a team yet when he was in high school. (00:33:35)
Factual error: When Elijah first meets David at the gallery, he says that he has Osteogenesis Imperfecta Type 1, which is the mildest form of the disease. But Elijah then states that there are types 2, 3 and 4, and that type 4's don't last very long. The types are not in order of severity, type 2 is the most severe form. Type 4 is actually one step more severe than type 1. (00:30:05)
Answer: Everything related to Samuel L. Jackson's character is upside down - to give a hint about his role in the movie.