Continuity mistake: Inside the radio station tower, Sasha is just being introduced to a new speaker calling in. The equipment assistant holds up a card saying 'Felicia' for Sasha, with his left hand. In the next shot it is in his right. (00:08:25)
Continuity mistake: When Michelle gets back into her car after escaping the gas station attendant, as she drives following the moments up to when she is decapitated in her car, her wet fringe keeps on changing position between shots. (00:07:25)
Continuity mistake: When the gas station attendant fills up Michelle Mancini's car, he is looking at her. The next shot shows that he's looking at her back seat.
Plot hole: At the end of the film, Brenda could not know that Nat and Paul were to drive the truck in order to wait inside it for them.
Suggested correction: Didn't Nat come there in that truck? And assuming the truck wasn't locked or lockpicking is amongst Brenda's veritable arsenal of skills, maybe she hid by the car until she saw them coming, and got in.
Plot hole: Brenda's shown to have survived at the end and is at a different college. This is never explained given she got shot, fell out a window, thrown through a car window and off a bridge into a river.
Suggested correction: Supposedly human killers surviving the impossible is a staple of slasher movies, though that doesn't really make this not a mistake. But people in real life have survived worse.
Continuity mistake: Brenda is showing Natalie a slideshow using a projector to show her how her boyfriend was killed; she firstly shows a photo, then a newspaper article. The article is left projected for the whole scene. That is until Brenda is shot out of the window, and now it is the photo that is back to being projected. (01:22:20 - 01:28:45)