Towards the end of the movie where Megan (Natasha Lyonne's character) is on ground looking up, and the whole cast of characters is looking down at her, the camera switches back and forth in its POV from Megan to the group. In the middle of this sequence, if you look closely at Hillary (Melanie Lynskey's character) you'll notice that although she's been "uglied-up" for the entire movie with bad glasses, in one of the back-and-forth cut aways her glasses magically dissapear. The change in her look is so startling (she's so attractive) I can't imagine how it slipped through. I had to go back through the sequence a few times because originally I thought they had added a new actress!