Revealing mistake: In the beginning when they're having shots at Hellfest, the guy with the gray shirt holding syringe shots has a stain directly in the middle of his shirt between the drawstrings, 5 seconds later it's gone. (00:13:32 - 00:14:03)
Continuity mistake: After Asher is separated from Quinn he's looking around a room with a flashlight and finds the killer. We can see the killer's eyes but a few shots later there is mesh over the eye holes of the mask. (00:52:15)
