Factual errors: After the fire alarm is pulled, Donna goes up to the 3rd floor from the ground floor using an elevator. It's against building codes to have elevators move after a fire alarm has been pulled. After a fire alarm has been sounded, all elevators go to the first floor and stop working, in order to ensure no one gets stuck in the elevator if a fire is actually occurring.
Audio/video fuori sincrono: During a scene where Donna is exiting her hotel room, she runs into Clair and both scream. However, Clair's scream cannot be heard, but an odd screeching sound is played in place of her scream, which continues even after her mouth has been closed.
Continuity: At the beginning of the movie, Donna and her friends are seen at the hair salon getting their hair done and recolored. However, near the end of the movie, which is that same night, her brunette roots can clearly be seen through her blonde hair.
Continuity: Despite being one of the few slasher films with a PG13 rating, whenever someone is stabbed, their bodies show no stab wounds when they appear again in the movie. The only character with blood stains where they had been stabbed has no holes in their clothing where the stab would have been, only blood stains.
Incongruenze nella trama: 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.
Continuity: While on the dance floor, Donna asks her boyfriend for the room key. When he hands her the key, shown from the long shot, it is the master key that the house keeper had which was white with a green circle, not the regular room key which is gray.
Audio/video fuori sincrono: During the scene when Miss Waters is about to announce Prom Queen and King, when Crissy says "Where the hell is she?" (referring to Lisa), her lips do not even come close to matching what the audio says.
Errori geografici: This movie is supposed to take place in Oregon and there are numerous palm trees visible in the background while the students are on the way to the prom. There are no palm trees in Oregon.