Continuity mistake: When Grossout comes by the passed out frat guy on the steps of the house at the beginning of the movie, he temporarily revives him sprinkling beer on his face. The cans in his hand change position between shots.
Continuity mistake: When the first trooper falls dead on the crates at the beginning of the movie, there's a continuity error since his hand changes position on the crate between shots. (00:00:55)