Crime Wave - S1-E24
Other mistake: Whenever a newspaper is shown, the content is the same no matter what the headline is.
Adventures of Superman (1952)
1 other mistake in season 1 - chronological order
Starring: George Reeves, Bill Kennedy, Jack Larson, John Hamilton
Revealing mistake: When the robot releases the balloon with the bomb attached, the wires used to pull the balloon up are visible as the balloon rises through the skylight.
Lois Lane: Eureka.