Continuity mistake: As Caitlyn types an instant message to let someone know Stephan has been suspended, she makes a :( emoticon. We switch shots to her and then back to the computer and the :( disappears. There is no sound of her hitting the backspace key to erase it, nor does she move the mouse in any way to remove it.
Continuity mistake: When Stephen (Hayden Christensen) and Caitlin (Chloe Sevigny) are talking at the party about Stephen going to law school, you can see her hair is in front of her right ear. In the next shot it's behind the ear and the following shot it's back in front of the ear.