Other mistake: Superman is always seen with his arms extended when he flies, but when he lands, it's always feet first. He's never seen changing his position to account for this.
Adventures of Superman (1952)
1 other mistake in show generally
Starring: George Reeves, Bill Kennedy, 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.