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: 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.
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.
Continuity mistake: After Nancy and Robert ban TV for a week, Brennan throws the ice pack he was holding on the ground. The camera then cuts to Robert, and when it cuts back to Brennan again just a few seconds later, he has the ice pack again and does the exact same action as before.
Continuity mistake: When the Billy Joel cover band is performing at the Catalina Wine Mixer, the guitarist is using a Divided by 13 head/cab. This is the green amp located by the drum riser. However, when Dale and Brennan take the stage, the amp has changed to a green Mesa/Boogie Stilleto Ace combo. You can see the Divided by 13 in the shot after the musicians have left, when Robert is explaining how he wanted to be a dinosaur behind Brennan's back, which shows that it wasn't moved by the musicians.