When Kelly falls off her bike after the lug nuts are loosened, she falls onto her left shoulder. Later she comes back to the club on crutches, her bruise and cast are on her right side, the opposite of which she fell on.
Adrien's hair goes from "up" to "down" to "up" again between Brittany apologizing to her and her conversation with Kelly.
When Brittany is putting on her lip gloss while talking, she is putting it on with her right hand and the gloss is in her left, when cutting back to her she is applying it with her left hand.
In the last scene Adrien's lip gloss goes from pale to shiny and back to pale as she talks to Andy.