The naval officers are wearing formal dress uniforms in spite of being on duty at sea.
After Jimmy takes a picture on the island, he says that Superman is developing the negative with his X-ray vision. X-ray literally ruins exposed undeveloped film.
Near the end Perry White is throwing something at Jimmy as he runs out the door. The door has no striker, or latch, revealing it to be a prop.
Clark Kent removes his glasses in front of Jimmy and Lois, but neither recognize him as Superman in spite of them meeting Superman many times face to face.