Visible crew/equipment: Lois and Clark are in the car when Clark finds a bomb in the backseat. He throws himself and the bomb from the car, and it explodes. When Lois stops the car to see if he is okay, virtually the entire crew is reflected in the side of the car - the camera operator, the man with the boom mike, and several others. (00:12:15)
Adventures of Superman (1952)
1 visible crew/equipment mistake in Five Minutes to Doom
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.