Factual error: A video is shown of Derek Huff singing "Ice Ice Baby" at a school talent show that took place when his brother Brennan was 17. Robert states his desire to retire in "in two years," in 2010, making the movie's setting 2008. Brennan is 39 in the film, placing the talent show 22 years ago in 1986. The song "Ice Ice Baby", recorded by Vanilla Ice, came out in the summer of 1990.
Continuity mistake: In the scene where Alice spells words with her food on her dinner plate asking to have sex, the very next view of her shows a smaller plate in front of her.
Continuity mistake: When Dale tells Brennan he needs to hear him sing, Brennan has a sword and is swinging it around. After he sings, he gets up and the sword is shown on the floor in its scabbard. They flash to Brennan, then back to Dale and the sword is gone.
Character mistake: When Brennan's brother is talking to Jack in the kitchen, he is holding a Heineken beer. However when he goes out in the tree house and shows the brothers his six pack, he claims he hasn't had a carb since 2004.
Continuity mistake: In the scene with the bullies, as the bullies are approaching and one says, "Hey, fag stick," Dale and Brennan are stationary next to a tree. When he says,"Long time no see," they are moving to the same position again.