Heavy Metal - S2-E23
Continuity mistake: Season 2 episode 23 "Heavy Metal": In the beginning, when Metallo and the Intergang goons raid the bank, the goons use conventional sub machine guns. But when they start tearing through Irons' neighborhood looking for Superman, the goons use the same guns, which have, however, suddenly become laser blasters.
Continuity mistake: When Lois recovers in her apartment from the knock-out gas and starts swinging, Batman pushes her against her nightstand. But once she calms down and the camera makes a wide shot from the ceiling of the room, Lois and Batman suddenly crouch quite a distance away from the nightstand.