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.
Continuity mistake: The mirror that the gentleman looks at to see if he is being attacked from behind changes completely when in a close-up, from a circular mirror to a more triangular one. (00:04:34)
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.