Other mistake: When Superman pulls off the vault door and places it flat against the wall, it begins to fall back and he holds it back. He then leaves and the door is suddenly propped against the wall.
Adventures of Superman (1952)
1 other mistake in The Big Squeeze - chronological order
Starring: George Reeves, Bill Kennedy, Jack Larson, John Hamilton
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)
Lois Lane: Eureka.