Lex Luthor: Kitty, what did my father always say?
Kitty: You're losing your hair?
Lex Luthor: Before that.
Kitty: Get out?
The two writers of the movie make a cameo appearance as the two teens in the museum who are told it's time to leave and they are a bit "man-handled." See more...
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Superman Returns (2006) - 35 mistakes
This movie follows on from Superman II, meaning that in effect the movies Superman III and IV never happened, which we should all be grateful for. As such no continuity mistakes relating to the later two films are valid.
Continuity: Near the end of the film when Lois makes to leave the hospital room after visiting Superman, she takes hold of her son's left hand with her right - meaning he should walk out whilst at her right side, furthest away from the hospital bed. In the next shot, both Lois and her son have swapped positions.
Continuity: In the scene when Lex is testing the kryptonite at the basement of the mansion, after the power outage, he is standing directly in front of a square yellow sign. Cut to a wider shot, and he has moved left and Kitty is now in front of the sign. Cut again and Lex is back in his first position.