Deliberate mistake: During the "breaking up" scene with Jim and Michelle when they're inside the cabin, her hair is crimpy, but when she walks outside and gets into her car, her hair is straight. This is because Alyson Hannigan filmed this particular scene during a break in the filming of a "Buffy the Vampire Slayer" episode. (01:15:40)
Continuity mistake: In the scene where John is peeing off Stifler's balcony, he knocks over a plant and knocks out Christy. In the next shot the plant is back, and in the one after that it is gone again. (00:17:15)
[Both sets of parents have walked in on Jim and Natalie having sex.]
Jim's Dad: [to Natalie's Dad.] Hi, I'm Jim's Dad. You must be the parents of this young lady. I didn't get your daughter's name, but I'm pretty sure my son did.
Trivia: In the scene where Casey Affleck answers a phone call as a young executive, look close to the two people in the back. They are J.B Rogers, the Director, and Adam Herz, the scriptwriter.
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Chosen answer: Yes. That's the point of the theory. Men multiply the number of women they've had sex with by 3, women divide the number by 3.
Captain Defenestrator