A Ghost for Scotland Yard - S2-E8
Visible crew/equipment: Superman takes a running leap to get himself airborne. For a split second the viewer can see the springboard he jumps from.
Adventures of Superman (1952)
1 visible crew/equipment mistake in A Ghost for Scotland Yard - 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.