Although the detective's name is spelled as "Roy" in the credits, throughout the movie, he is called "Detective Ray".
When Rory gets his tattoo, a streak of blood appears on his arm before the first cut is made.
When Kyle and Chloe first meet, she puts the cigarette in her mouth twice.
When Chloe joins Kyle and the others in the woods, her words are obviously dubbed and do not match her lips.
Actors mark (electrical tape) visible on the floor when Kyle discovers Shane and Munn in his kitchen.
When Shane and Kyle meet in Biology class, the boom mic lowers into the frame twice.