Revealing mistake: During the scene where the gang attempt to catch the parrot, One-Round gets his legs stuck in a chair and falls over, breaking the chair in the process. About a minute later Herbert Lom breaks the record and it cuts back to One-Round, and the exact same shot of him falling over is seen again.
Revealing mistake: Whilst Spencer Tracy is driving the Jeep through the desert at high speed, during one of the long shots the rough terrain causes the vehicle to bounce violently; if you look carefully you can just make out the stunt-driver's "missing" arm coming out from beneath his jacket to help wrestle with the steering wheel.
Revealing mistake: When Cary Grant walks into the office of the restaurant of his friend the kitchen has the center island to the right of the dishes tray, right of the light, and right of Cary's view to the dishwasher. There is a single row of dark tiles between the island and the cooks in blue. Later when the dishwasher turns and walks toward Cary the center island has been moved to the left. It is left of the dish tray, left of the light and is now showing three rows of dark tiles between the island and the cooks in blue.