Deliberate mistake: It is shown throughout the film that card keys are to be used to open the hotel room doors; this is a security measure that is used for doors in elegant and expensive hotels (if not all). There are no hotels that use this measure without having break-safe metal material inside of these doors, yet the killer and cops are shown breaking down doors fairly easily. Add to this the fact that only thin slices of wood are shown breaking off of the doors, not metal nor even the card-keying device.

Prom Night (2008)
1 deliberate mistake - chronological order
Directed by: Nelson McCormick
Starring: Brittany Snow, Scott Porter, Dana Davis, Jessica Stroup
Plot hole: When the cop is in the room and he realises how the teacher escaped from the hotel, he pictures him walking out in the bellboy uniform while the cop is downstairs. However at this time he should be upstairs with the girl in her room, because he is still in the room when she runs out of the room into the cop. For this to work out, the teacher would have to have left the room before the girl even got there.
Officer Shawn: Three years ago... a high school teacher got obsessed with a female student... He went psycho... He's been in a maximum security prision until three days ago.
Trivia: The hotel where the school holds its prom in "Prom Night" (2008) is the same hotel where the school holds prom in "Not Another Teen Movie."
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