At the beginning of the movie, when she is telling about her past relationships, it shows her high school boyfriend kissing another guy. If you look really close, the boyfriend has his hand over the other guys mouth, so they are not really kissing.
At the end of the movie, after she realizes she messed up and she was walking back to her apartment- she's hears hamlet- she is carrying a salad- she moves really quick and the dog flies past her and she doesn't have the salad anymore as she starts talking to Jim.
Actually I'm watching the movie right now (on DVD on my computer) and it looks like he just has his hand on his face and just moves it away. I don't think he has it over his mouth. I'm not sure though. And about the salad one: That's right! Good one. That's a big slip up.