The Scorn of the Star Sapphire! - S3-E5
Continuity mistake: After Hal crashes the Batmobile/jet, Carrol and the reporter take off in a fast car towards the crash site. They are moving at racing speeds and there is no other vehicles around them as they zoom away from camera. But then they get to the crash site and suddenly there are two fire trucks driving beside her car and keeping up. They were not there a moment before, and a fire truck could not have caught up to a sports car going that speed. (00:07:25)