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In the opening scene at David Ames' apartment as he is getting out of bed, a poster of the Bob Dylan album that he later recreates with Sofia is hanging on his bedroom wall. See more...
Vanilla Sky (2001) - 3 major mistakes
Directed by Cameron Crowe, starring Cameron Diaz, Jason Lee, Kurt Russell, Penélope Cruz, Tom Cruise (add more)
Genres: Drama, Mystery, Romance, Sci-fi, Thriller
Apologies if this gives anything away, but it's been out a while. It's made very clear by "tech support" towards the end, that everything AFTER the night at the club was part of the lucid dream. Therefore everything BEFORE the night in the club is 100% real and normal (except for obvious dreams, like the one at the start), so any mistakes in that section of the film are either fun stuff to spot, or real mistakes, and cannot be explained away by the "lucid dream".