Visible crew/equipment: Ursa throws the sewer lid at Superman sending him flying backwards into the car windshield. Watch the sewer lid carefully when Superman actually hits the windshield. You can see that the sewer lid was actually attached to a belt around his waist so that it would stay in place for the shots where he is flying backward through the air.
Trivia: Richard Donner, the director of Superman, was originally hired to make Superman II. He had made over half of the movie before being fired. Richard Lester was hired to complete the film. So, Superman II contains footage from both the Richard Donner version and the Richard Lester version.