In the final 'explosive' scene, before the plunger is pushed, the corner of the room that Bam Margera is sitting in is relatively empty. However, when the Johnny Knoxville orders everyone to put on their goggles and proceeds to push the plunger, a bookcase appears in the corner.
Right at the end of the film, when Rip Taylor is throwing ticker tape down on the boys, Rip is shown to be wearing nothing on his head. Then, when the camera angle changes and pans back to Rip, he is wearing a hat complete with horns.
During the Dickhouse opening stage scene, Ehren McGhehey is missing a tooth. In "The Lamborghini Tooth Pull" scene his tooth is there. That means he for his tooth pulled before going on stage.