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.
Jeff Swanson
Adventures of Superman (1952)
1 revealing mistake in The Gentle Monster
Starring: Bill Kennedy, George Reeves, Jack Larson, John Hamilton
The Dog Who Knew Superman - S2-E9
Other mistake: A gangster pushes a dog into a well and the dog can be heard splashing around. The man's wife is furious and several people are unable to retrieve the dog. Superman tunnels into the ground and into the bottom of the well and emerges holding the dog. Both he and the dog are completely dry.
Lois Lane: Eureka.
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