Harry Potter and the Deathly Hallows
The long-awaited final installment in the Harry Potter franchise was broken into two separate films. Throughout the book series, Harry is always told that he has his mother's green eyes. In Harry Potter and the Deathly Hallows, the actress who played Lily Potter had brown eyes.
Harry Potter and the Sorcerer's Stone
The Hogwarts dining hall is an iconic staple of the Harry Potter universe. However, in the second film, some shots reveal the wires used to keep them afloat. So much for movie (and wizard) magic!