Continuity mistake: Hallie takes the remote control off the top of the TV to turn it on. But later when they return in front of the TV to watch the news report, the remote is back on the top of the set. Also, the position of the video console which is also on top of the TV has changed, the position of the clothing on the chair next to the television has repositioned and lastly, the items on the window sill behind the TV set have completely changed.
Continuity mistake: When Cici is thrown from the balcony there is debris from the window all around her (glass & window pane fragments), but if you watch when she is thrown through the window in the first place, it is only a bit of debris went that far away, not nearly as much as it is shown around her.
Continuity mistake: Shortly after the scene in which the killer pulls Randy into the van, Gale and Dewey run to the van and see the blood. Right before they open the door, there is a camera shot from inside the van through the window. You can see that the window is not broken: it is obvious that there is some sort of white fabric over it.
Continuity mistake: In the beginning where Jada Pinkett Smith is stabbed in the back, you see a white girl to her right look down at her arm as Jada's blood lands on her. If you watch the background closely as Jad is dying and stumbling around, the same girl is still looking around, as if it just happened.
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.