- Factual errors: After the fire alarm is pulled, Donna rides the elevator to the 3rd floor. When a fire alarm sounds, all elevators go to the first floor and stop working, so no one gets stuck in the elevator during a fire.
- Continuity: During one of the dancing sequences, gold strips of confetti fall from the ceiling to the dance floor. However, when the camera angle changes and the music stops, the confetti has disappeared.
- Continuity: At the beginning of the movie, Donna and her friends get their hair colored at a hair salon. Near the end, later that night, her brunette roots are showing through her blonde hair.
- Continuity: Despite being one of the few slasher films rated PG13, whenever someone is stabbed, their bodies show no stab wounds when they reappear. The only character with blood stains where they had been stabbed has no holes in their clothing where the stab wounds would be.
- Plot holes: Despite Claire's and Michael's very audible screams, none of the other guests on the floor check to see what is going on or alert security.
- Factual errors: When Donna looks at her bottle of pills, the label says "Klonapin." The correct spelling is "Klonopin."
- Factual errors: The movie plot revolves around the fact that the characters are staying the same hotel as their prom. As a rule, hotels don't rent rooms to prom-goers.
- Crew or equipment visible: When Donna is going back to her room after the alarm has sounded, the camera switches from behind to in front of her. When it does, you can see a man walking around in T-shirt and Jeans. The entire building had already been evacuated and no one should have been upstairs. That and besides the fact that everyone was in prom attire.
>>> WARNING: Here Be Spoilers <<<
Goofs below here contain information that may give away important plot points. You may not want to read any further if you've not already seen this title.
- Continuity: SPOILER: When the bad guy is shot at the end of the movie, it shows that he was shot in the left shoulder above the pocket on his shirt. The scenes switch from far to close and the bullet wound vanishes and reappears only to vanish and reappear again.
- Continuity: SPOILER: Near the end of the movie, when the killer is shot, he holds the knife in a stabbing position. Although when he falls, the knife changes positions. If it didn't change positions, it would have stabbed the floor.
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