Wren's glasses on her head change when Paul asks her for a date.
After Wren's landlady hears someone breaking into Wren's apartment while watching TV, she runs out into hall and suddenly has smears of white beauty creme under each eye.
Near the beginning of the film, the same two guys - one shorter in a torn red shirt and one taller in a white shirt - can be seen at the front of the line and entering the Peppermint Lounge between shots.
In end of film when the girl gets ejected from the club by bouncers the boom mic is visible.
Wren comes bouncing into Cecile's apartment, she gets a beer can out of the fridge, doesn't open it but makes like she is drinking from it, and then breaks the "fourth wall" by looking directly at the camera for a couple seconds.