Continuity: When Phil and Maureen get inside the cinema and sit down, Maureen removes her bag from her shoulders. But in a following shot of her, you can see the bag straps back on her shoulders.

Continuity: After Sidney slaps Gale on the face, Gale's hair changes its appearance / position between the two reaction shots.

Revealing: When the killer is attacking Cici on the balcony, you can see blood on Cici's back before she is even stabbed and both times she is stabbed, the knife that comes out of her back has no blood on it.

Continuity: 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 windowsill behind the TV set have completely changed.

Continuity: When Sidney is doing her theatre performance, when she lifts up her red veil she wraps it around her shoulders twice between shots.

Continuity: When Sidney and Dewey are talking under the gazebo, before Dewey walks off, Sidney is leaning against one of the support beams of the gazebo. In the next shot she is standing at the centre of the staircase, away from the beam.

Continuity: When Sidney wakes up and answers the phone, the position of the watch on the desk, beside the caller ID, changes between shots.

Continuity: When Cici is running away from the killer, when they reach the second floor of the sorority house the distance between them greatly increases between shots.

Continuity: In the opening scene, the position of the bag straps and tee-shirt straps on Maureen's shoulders keep on changing.

Continuity: 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.

Continuity: When Phil and Maureen enter the cinema, Phil puts his arm around Maureen's shoulder. But in the next shot his hand is placed on her back instead.

Visible crew/equipment: If you look really close in the background as the killer throws Cici off the balcony, you can see someone sitting in a tree, wearing black, with a camera.

Revealing: Just before the cop gets impaled through the head by the pole, you can see that it is obviously a dummy.

Factual error: If the glass in the cop car is weak enough for the killer to smash it without hurting his hand, shouldn't it be weak enough to break when he throws the cop against another window hard enough to draw blood?

Revealing: When the killer attacks Sid's bodyguards, the younger one has blood on his throat before the killer slashes it.

Continuity: When Sidney and her friend get into the police car to be taken to protection, Sidney sits on the driver's side. When the car crashes, she is on the passenger side.

Continuity: When the Sheriff writes "Cici Cooper" on the chalkboard, between the closeup and wideshot of him writing, the handwriting and location of his writing dramatically changes, and the words "Maureen Evans" and "Phil Stevens" above, also change too.

Revealing: In the opening scene when Phil gets stabbed in the head, watch carefully and you can see the retractable blade popping back out when he pulls his head away.

Audio problem: When Dewey is being stabbed up against the soundproof glass, you see a shot of Gail shouting "No." You can see a reflection of the killer in the glass standing motionless, but you can hear Dewey being stabbed.

Revealing: When Cici is stabbed in the sorority house, her shirt is bloody, but there is not a hole in the material.