Revealing mistake: In the scene on Christmas morning when the Bumpus' dogs run in and eat the turkey, during the shot of the dad sitting in the chair reading the comics, one of the dogs bumps the camera and jostles it a little bit.
Revealing mistake: In the scene at which Dan Aykroyd first joins his employers at the gentleman's club, Don Ameche is shown mirror image when he adds his signature. It happens again at the very end, during Ameche's credit, one of these flipped shots from this scene is repeated. (00:12:00)