When Sean Bateman answers the payphone call from Paul, he asks if it's Patrick calling. Patrick Bateman was a character from American Psycho, which was made by the same production company. Also, Patrick Bateman was Sean's brother in the novel. See more...
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Continuity: 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.