Other mistake: Stifler, Finch, Oz and Jim all have radios. Stifler says during the lesbian scene that they are getting naked. This should have been heard on Jim's radio (he is under the bed), but it is not. We never see Jim turn his radio off as his hands are in shot. (00:43:20)
Factual error: The end credits to the movie, which features the Harvey Danger song "Flagpole Sitta" (1997), incorrectly credits it as "I'm Not Sick But I'm Not Well" by LIT. No such song exists, nor have LIT or any other group ever officially recorded covers of "Flagpole Sitta."