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.
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.
Factual error: Bearing in mind the episode takes place in London, Sir Arthur MacCready is driving his Rolls Royce. The car has the steering wheel on the left hand side. A true British Rolls Royce would have the steering wheel on the right side. This is a Hollywood Rolls Royce.
Continuity mistake: In the first episode, "Superman On Earth" (and one subsequent episode) Jimmy introduces himself to Clark as James Bartholomew Olson. In the episode "Jimmy Olson, Boy Editor" the sign on the Editor In Chief's office door reads James J. Olson.