Goofs

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.

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.

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.

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.

Fenton breaks the hotel room door with a fire extinguisher. Hotel room doors are solid, not made of the hollow cardboard-like substance used in interior doors. It would take more than a few hits with a fire extinguisher to break through one. A fancy hotel like the one in the film would definitely have high quality doors that are difficult to break down.

The authorities decide that the best course of action would be to guard every entrance and exit of the hotel to lookout for the killer because they don't want to spoil Donna's prom night by evacuating her and her friends. Not only is this a ludicrous justification for why they don't alert Donna and her friends and getting them to safety, it's also ignoring the hundreds of innocent bystanders that are in the hotel that could be in danger as well. Evacuating the premises would be the authority's first step.

When Donna looks at her bottle of pills, the label says "Klonapin." The correct spelling is "Klonopin."

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.

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.

Richard Fenton's "disguise" is hardly foolproof enough for him to get around undetected. He merely trimmed his beard, leaving some stubble, and cut off his shoulder length hair to a buzz cut, and wears a baseball cap. That's it. The authorities would still be able to recognize that it's him based on his build, face shape, and overall physical appearance alone. Even stealing the clothes of a bellhop would not be enough of a disguise, as his face is still exposed even then.

Why wouldn't Donna lock the bathroom window when she found it open, after waking from a nightmare of being attacked in the bathroom. There's an obsessed killer, that killed her entire family, then escapes prison 3 years later, kills her friends in order to get to her, and she still leaves the window unlocked, simply does not make sense.

How did Richard Fenton manage to hide all of the corpses so that they wouldn't be discovered by other guests and hotel staff?

Why did it take 3 days for Detective Winn to be notified by his superiors that Richard Fenton had escaped the mental institution?

How was Richard Fenton able to sneak into and escape from the hotel when security guards and police officers are guarding every entrance and exit?

When Detective Winn exits the hotel after failing to find Fenton he announces to the other cops, "We have three dead: one maid and two kids." He left out the dead man found in the trunk of his car (Howard K. Ramsey), whose body he had seen less than an hour earlier.

As Lisa and Ronnie are about to have sex, she finally recognizes the stranger as Donna's former teacher and goes off to warn her. Why didn't Lisa both, tell her boyfriend that Fenton is Donna's former teacher, and bring him with her? She unwisely runs off alone and as a result, stumbles into a dark and abandoned basement.