Continuity: At the garden party, when Scarlett Johansson is sitting on the bench and talking, her hair is alternately tucked in and then on the outside of the sideframe of her glasses.

Plot hole: Peter Lyman's secretary thought he had poisoned her because she was finding out that he was the Tarot Murderer. He wasn't, and hadn't yet committed his only murder. So she could have been wrong about having been poisoned, but what could she possibly have found out about him, if he wasn't the murderer at all?