Continuity mistake: When Cindy and Buddy are in the cool room and she is talking on the cups, you can see what appears to be blood on the bottom of her pants. In a scene cut from the film (it's on the DVD), Cindy covers the floor in blood before they get pushed into the cool room (spoofing Hollow Man). Since scene wasn't in the film, she shouldn't have the blood on the bottom of her pants.
Picture added & edited by A Demon
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