I'm not sure if this counts, but at one point, Cara is signing a letter to send to the author and putting it in a priority mail envelope. She then folds the edge over to seal it, but she never removed the protective strip, so it wouldn't have stuck.
While Megan and Cara are talking and sharing ice cream on a couch, Cara says that she is really 31 and the ice cream container is in Megan's hand. In the next shot, the container is in Cara's hand with no exchange taking place.