Before Clark Kent moves the heater in Perry Whites office, he locks the door. When Perry returns to his office to get his hat, the door is unlocked.
Caesar's ghost speaks the line, "Friends, Romans, countrymen, lend me your ears." That famous line, from the William Shakespeare play, was actually spoken by Marc Antony, not Julius Caesar. This is a suitable mistake for a scam artist impersonating the historical/literary figure Gaio Giulio Cesare.
When Perry White tries to exit the plane in flight, the rear door is nothing more than a regular house door with a handle style door knob. No plane would have such a simple door and latch on an airplane.
When Perry White is on his airplane he hears a voice. Shortly after, Superman says he sees no type of recording or speaker. That can't be. It had to be concealed on the plane.
While Perry White is in his office late one night, a food order is delivered; it includes coffee. The delivery man says he ordered it with two lumps of sugar, and White acknowledges, "yeah, two lumps, that's what I take." But in Money to Burn (1957), it's stated several times that White never drinks coffee.