Other mistake: When Ryan and Alex are first together in the hotel room, there is a gratuitous nude view of her getting on the bed. The body double used for this couldn't be more than 21, and her appearance is quite at odds with the character, who is pushing 40.
Factual error: When Bateman orders Clooney and Kendrick to return to Omaha from Detroit, there is a shot of them waiting in the McNamara Terminal. This Terminal, however, only holds Northwest/Delta flights. They would be in new North Terminal of Detroit Metro Airport, since they fly American Airlines.mmcavner