When the doctor is talking to Frank early on, her back is turned, but her head and face movements do not match her speaking.
The white sports car they purchase has no front license plate, which is mandated in Oregon, where the movie takes place.
When Simone loses her car from the moving convertible, it lifts up rather than being pulled back by the wind.
It seems off walked into the hotel room when a cleaner is inside. The cleaner would likely have placed a sign on the unit door, or at least have propped it open to indicate her presence.
When they purchase the corvette the production did not remove the camera off the front window, went a little cheap with the cuts and not did the scene without it.