Continuity mistake: When Sidney leaves her dorm room to head for the shower and Hallie follows, you can see the open wardrobe by the dorm door, and there is a jumper visible hanging from the wardrobe door. But when they walk back into the room to look at the news on TV, the jumper has moved and now there is a bag visible in front of it as well. (00:13:05 - 00:13:50)Hamster
Continuity mistake: When Dewey is being stabbed in front of Gale in the soundproof room, there is already blood on his his shirt. But you have to look very closely.
Continuity mistake: In her room at the start, Sid's hair is a little bit over her eye. She talks to her roomate and walks out of the room. The next shot her hair is perfectly behind her ear, but she didn't have time to put it back. (00:13:05)
Continuity mistake: Cici throws a plant at Ghostface as she's running away from him, but it barely slows him down. They round a corner around the banister and he is chasing her right behind her, only about 2 or 3 feet behind her at most. But then it cuts to another shot and suddenly she's down a hallway and instantly put a lot of distance between herself and Ghostface before he's even entering the hall.Quantom X
Factual error: When Cici is about to be killed she throws the phone onto the floor without hanging up yet the killer calls her again and the phone rings. Surely it would be engaged if she had not hung up.