When Cyrus meets with Mel about 6 minutes in, the cigar ash from the tip of the cigar changes lengths.
In the scene where Veronica (Kristen Bell) scratches Mercer's (Ryan Devlin) cheek, when he looks in the mirror the scratch is on the other side.
After realizing she's been "roofied" by the RA Veronica tries to leave but realizes that she's been locked in. No dorm room would be allowed to have an un-openable door in a residential room.