When gangsters Horton and Tips leave Clark Kent's apartment with the lead pipe they believe contains Kriptonite, Superman (as Kent) looks through the wall, into the hallway, with his x-ray vision to observe what the gangsters are doing. But Superman's x-ray vision point-of-view is from the opposite side of the hallway, toward the apartment door - not from within the apartment.
While Jimmy and Clark are talking in the latter's office, Clark's right arm position changes from laying in the desk to supporting his head to back in the desk.
At about the 18 minute mark, Clark exits his office grabbing his hat. A moment later he is in the hallway and enters the storeroom. His hat is nowhere to be seen.
Superman squishes Cy Hortons gun in his hand. The close up shot of the of the gun reveals that it is clearly not a real gun or even a regular prop gun. It's very obviously molded out of some soft, pliable material that had been shaped and painted to look like a gun.
When superman is being interviewed on TV. There should be production people in the studio seeing everything that is going on,, especially a camera operator. but he is shown all alone, covering his identity with the sculpture.