Revealing mistake: When they leave the studio to get into the taxi, there are multiple onlookers in the shot watching the scene from across the street. (00:06:00)
Revealing mistake: When Spencer Tracey backs his car into the hotrod at the ice cream stand, you can see the hotrod already has a sizable dent before the car makes contact, probably a result of a previous take.
Revealing mistake: There is no glass in Spencer Tracy's eyeglasses.