Revealing mistake: When John Garfield is trying to stop Lana Turner from calling the District Attorney, Garfield holds the receiver up in the air off the hook. Then the phone rings. But a phone cannot ring when it is off the hook.
Revealing mistake: When Cora's lawyer comes to the diner to tell her that townspeople are talking about Frank and her living together, Frank is holding a serving tray with glasses on it. The tray is tilted at an impossible angle yet the glasses still stay on the tray.