Continuity mistake: When Marcia Gay Harden is doing the final preparations for the party that night, she and Anthony Hopkins have a dialogue where they talk about favorites and children. Towards the end of the dialogue, she hugs him and the watch on her wrist says something like 10am. A minute later she hugs him again and the watch now says 12:25.
Continuity mistake: In the beginning where Claire and Anthony are waiting for "Drew" to arrive they are talking. She says to him while putting her hand on his tummy "Get some food in that flat tummy of yours". On the first shot of this Anthony's arm is out with his hand resting on his hip. In the next shot (as she's pulling her hand away) his arm and hand are down by his side with her arm over his. Not possible.