When in the store at the checkout Monk has to put back some of his groceries, Nathalie tries to let him decide which can of soup can be returned. Monk can't choose and says "It's like Sophie's Choice...exept...it's soup"
A man parks his motorcycle outside the museum while two detectives are talking. As he's getting off the bike, one of them says to him, "that's a handicap spot" to which he replies, "it's okay, I'm psychotic".