When Donnie is kissing Kahla, and it cuts to Matt watching them, Donnie is no longer wearing his hat.
Donnie's shirt read "Grab life by the throat and live it to pieces" when he's inside, but outside, it reads "Life fast, die old."
At the beginning of the movie Taylor is clearly shown to live in a dorm. At the end of the movie, it appears he is in a house.
30 packs are not sold in South Carolina.
When Patrick and Spencer are talking, a boom pole laying on the ground and be spotted to Patrick's left when it is showing their backs.
When Kevin is talking to Tyler, a tripod can be seen over his left shoulder when we see his back.