Continuity mistake: When Lauren and Lara share cocaine in their dorm room, Lara's face starts out clean. After a few quick cuts between the girls, her nose is dusted with white powder. There is another quick cut to Lauren and back to Lara, and the powder is gone, before she has had a chance to wipe it off or move.
Lauren: Abstinence is 100% safe, which is less of a percentage than.
Lara: Whatever, I don't care, I don't major in math.