Deliberate mistake: The sex scene between Paul and Marcy is broken up with a shot of Karen dying alone in the toolshed. The shot is well-lit, but we saw Marcy closing the door when she put Karen back in the shed, leaving the shed virtually pitch dark. So where is the light coming from? (01:02:35)

Cabin Fever (2002)
1 deliberate mistake - chronological order
Directed by: Eli Roth
Starring: James DeBello, Cerina Vincent, Rider Strong, Joey Kern, Jordan Ladd, Arie Verveen
Revealing mistake: Despite her very vigorous thrusting when she makes love with Paul, the bed sheet covering Marcy's ass doesn't get shaken off. Not even a little bit. Also, when they finish, she collapses on to him and he wraps his arm around her back. When he does this you can see that his arm is coming up from near the bottom of her waist. If his arm lines up with her lower waist, then Marcy's crotch must line up with his chest or belly - much higher then it needed to be to have sex. (01:02:40)
Justin: Yeah, he's a professor... of being A DOG! oooh, faced... Scratch moded.
Question: I just want to know when the girl flips over her boyfriend in the sex scene what in the world is she supposed to be doing?
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Answer: Sticking her finger up his bottom. I believe it is mentioned in one of the commentaries.