Continuity mistake: Before Clark steps down off the trolley, a group of people surrounded by suitcases are seen on the back, but disappear when the angle changes.
Continuity mistake: When Nuclear Man is destroying Metropolis, the same stuntman with a gabardine and a hat is seen close to a shop window, then a second later in the middle of the street and a second afterwards getting thrown through the air with a group of people. He looks and dress just like Clark Kent, guess it's his stand in doing some extra work.
Revealing mistake: Before Superman brings the cosmonaut safely to his spaceship the entrance door wiggles as if made of cardboard. There's no air in space and it's supposed to be a strong, solid structure.
Revealing mistake: In this scene, all the SWAT cops have the same type of rifle, except for the guy that gets his melted by Nuclear Man, which is a thick rubbery prop.
Continuity mistake: The Statue of Liberty manages to fall down straight the whole long time, but when it is is about to hit the ground, the angle changes and the statue has magically tilted sideways.
Other mistake: Nuclear Man is shown blowing up the Great wall twice, but it's the same shot reversed.
Continuity mistake: When Superman falls straight and unconscious off the Statue of Liberty he's facing a 9 o'clock direction. In the next angle he is facing 5, then lands facing 7.
Continuity mistake: When the lava is flooding the village, a big green plant appears close to a priest. When Superman cools the lava and the smoke goes away, we see that the plant is much smaller and less leafy.
Continuity mistake: When Superman takes off after saving the boy in the Great Wall of China scene, you see him heading up, as if leaving, but in the next cut, he's on the ground next to the wall.
Continuity mistake: Lex's fat assistant enters the place with the missiles' control panels. Outside he is seen entering through an open door. From the inside, the door is closed and he enters a second later.
Continuity mistake: When Nuclear Man lands on Metropolis a cop on the right is opening the door of his car. In the next shot he is repeating the movement.
Continuity mistake: When Nuclear Man arrives to earth, full of energy from the sun, his footsteps don't glow; neither do they when he arrives to the balcony, several scenes later. Then a couple of seconds after they glow but stop glowing when he walks towards Superman and keep that way for the rest of the film.
Continuity mistake: When Superman is taking the missile with the rest of the weapons, its colour changes from dark black to light grey.
Revealing mistake: Near the end of the movie, Superman descends on the tower, by the elevator room, and his supporting wires are visible.
Continuity mistake: During the volcano eruption the animal on the right (goat or sheep, I don't know) keeps changing from brown colour to white.
Continuity mistake: When Superman throws the rock into the volcano, it flies from right to left into a huge cloud of smoke. In the following angle, it is falling from the blue clear sky, up away from the smoke.
Continuity mistake: When the volcano erupts, a wide shot shows a group of people behind the cop and the priest. In the following shot a woman appears in front of the cop.
Plot hole: Nuclear Man flies through the floor and ceilings of the Metropolis tower without touching anything or anyone; but an outside shot shows the facade exploding for some reason.
Continuity mistake: After the SWAT van is lifted, it tilts forward. A frame later, it's looking sideways.
Continuity mistake: The cab's hood, crumpled by Nuclear Man's power beam, magically smoothes itself a frame later.
Answer: There appears to be multiple reasons. They had creative differences, ultimately resulting in a poorly received movie. Kidder said Reeves, who co-wrote the story, had an inflated ego and clashed with Furie.
raywest ★