Continuity mistake: On the 20th date, Trish and Andy are sitting on a chair discussing the date and that they are going to have sex. When Andy speaks, her right hand is on his top button. When Trish speaks, its back in her lap. This happens three or four times, all in the same conversation.
Add timeian rasmussen
Continuity mistake: When Andy and his friends are on the loading dock smashing the bulbs, there is a white mark from a smashed bulb on the dock next to Cal. But in the next shot the mark has vanished, and Cal smashes another bulb in the exact same place, producing the white mark again.
Continuity mistake: During the "Aquarius" montage at the end of the film, Andy's "man-o-lantern" chest-wax job is visible in one cut (with the hair just starting to grow back), then completely gone in the next. Since the bedroom scenes in the song are meant to be from the same night, there's no way that his chest could fill in so evenly so quickly.
Factual error: When Cal and Dave are playing videogames and coming up with different ways to tell whether or not they're each gay, Cal is using a Nintendo 64 controller. The version of Mortal Kombat that they're playing could only be for Playstation 2, Nintendo Gamecube, or Xbox.
Continuity mistake: During the scene where Beth is in the bathtub, all of Andy's shots have Beth's foot in the lower right hand corner, even though she only has her leg up for portions of the scene. Eg: when Beth puts her "friend" in the water, both her legs are under; we cut to Andy and the foot is in the shot, and then we cut to Beth and both her legs are still under.
Continuity mistake: There is a shot of Trish's hand on Andy's shoulder and her other one in her lap when they are talking about selling his action figures on eBay. The camera switches to an over-the-shoulder shot of her and both hands are in her lap. The view switches instantly, so there's no time for her to move her hand.
Add timeNick Bylsma
Continuity mistake: When Andy arrives at work the morning after it was revealed that he is a virgin, he pulls open the door to walk into Smart Tec and his bike tire gets caught in the door. In the shot following, the door closes behind him as if he pushed the door open and had not pulled it open.
Other mistake: When Andy first meets Trish, they are looking at a display of DVD players and VCRs. She points to a DVD player and says "This one looks pretty good." Andy replies, "You don't want that VCR." Although a display card has been deliberately placed in front of it to mask what it really is, the VCR appears to really be a DVD player.