Continuity mistake: In the scene where Christina decides not to be afraid anymore and runs after Peter, she comes out of the house and first shouts while facing in the wrong direction. She knew that he went the other way, because she saw him leave. (Shot at different times, confirmed on DVD commentary.)
Continuity mistake: When Christina, Courtney and Jane are singing a song with everybody in the restaurant, a guy with glasses says a line of the song while bending over, then straightens up toward Courtney. In the next shot, he is still bent over, and again he straightens up toward Courtney.
Revealing mistake: If you look at the instrument gauges right before the foil "bird" hits the windshield, you can see that the car isn't actually moving on its own because the speedometer is at zero. All of the warning lights are on also, meaning the car most likely isn't started at all and the key is just turned forward.
Continuity mistake: When the water is spraying Courtney in the gas station bathroom, you can see her bra is black. You can also see that Christina is wearing nude-colored underwear, yet when they are getting in the car and removing their wet clothes, Courtney's bra is now pink and Christina's underwear is white.
Continuity mistake: In the wedding scene as the bride and groom are about to take their vows the bride begins to scratch at her neck, she then attempts to blow a bit of hair, that has come loose, out of her eyes. The camera then moves to the vicar and when it moves back to her seconds later her hair is tucked neatly behind her ear.
Audio problem: When Courtney and Christina are in the club bathroom (right after the shot of the girl with the vomit on her face puking on her friend) the camera pans over to them both. In the mirror you see both of them talking but their lips are not moving to the sound you hear.
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