Superman is covered in plaster dust when he busts through a wall. He's clean a moment later.
The very short piece of recording tape that Clark Kent finds at Ray's apartment would not produce the length of sounds they played in Perry White's office.
Ray did not know where he was being taken to leave a tape containing clues to Echo Canyon.
Superman jumps out of the same window at Inspector Henderson's office as the one he jumps out of at the Daily Planet.
The exterior of the police station is shown at different times, but the same two cars are parked outside and the same cop is riding his tricycle in the same direction, obviously reusing the same film footage.