Other mistake: When Jaws breaks the glass in the control room, it shatters and flies everywhere, but the water doesn't even move or give any indication of flooding the compartment.
Other mistake: When Norman and Mary are at the swamp, the sheriff hands him the ashtray they found and bates explains that it belonged to Mr Toomey. Mary say "Who"? and the sheriff explains who he is. This makes no sense as Mary knew full well who Toomey was and had no reason to play dumb.
Upvote valid corrections to help move entries into the corrections section.
Suggested correction: She wasn't playing dumb. She says WHO because she didn't hear the name correctly.