Continuity mistake: In the barn, Superman puts a glowing crystal inside a pocket. A frame later it disappears.
Continuity mistake: Luthor holds a sealed champagne bottle with both hands on the neck of it. He doesn't move them, nor his shoulders, nor do we hear any sound revealing that the bottle's being opened. However, when Luthor leaves, the bottle's seal appears opened and 20 centimeters away when the scene ends.
Continuity mistake: When the truck is carrying the missile, the officers parading in front of it pass by the same place twice.
Continuity mistake: Before Superman enters the UN hall, the amount of people by the staircase changes between shots.
Continuity mistake: During the volcano eruption scene, an old man with a black hat on the right appears and disappears depending if the shot is a close-up or a wide shot. This even happens when the shot changes follow one another immediately.
Continuity mistake: While Superman is taking the Statue of liberty back to its place the sky keeps changing between violet and blue, sunny and cloudy.
Continuity mistake: When Superman leaves Luthor in the quarry, he lands several feet to the right of the cop. In the close-up they are almost close to each other.
Continuity mistake: Shortage of extras in this film: Inside the UN hall, the arab man that greets Superman is the one that a second before was in the entrance, together with the woman with a pink handkerchief over her head.
Continuity mistake: When Superman lands Lex on the quarry, the standing position of the prisoner behind differs between shots.
Continuity mistake: After the two police cars are sent backwards, a third one that was parked behind, suddenly appears aligned with the other two.
Continuity mistake: When Lois is in the subway carriage crying for help, she places her right hand on the rail above. A frame later the hand is by her waist.
Continuity mistake: Before lava covers the Italian village, furniture under the two arches on the right, as well as a vase, cart wheel and table on the left disappear between shots.
Continuity mistake: Nuclear Man arrives at Luthor's apt. and steps into a dark corner, where he loses his powers. From the opposite angle the place is filled with light, so Nuclear Man shouldn't have lost his strength.
Continuity mistake: While Superman walks with the kid to the UN, the sky changes from sunny to cloudy in a nano-second.
Continuity mistake: In the gym, the amount of sport bags on the back differs between shots.
Continuity mistake: While the lava flows on the Italian village, a wooden cart with hay on the left suddenly becomes a red car.
Continuity mistake: The debris on the bottom of the Statue of Liberty's base appears and disappears between shots.
Continuity mistake: Superman land on the middle-top of the missile, but a second later he is further down and on the side of it.
Continuity mistake: When Nuclear Man fires at the fire truck a short piece of hose comes out. A second later, in the following shot, the hose is 10 meters long and all over the place.
Continuity mistake: When the satellite knocks the Russian cosmonaut, they are both dragged into space, but the immediate wide angle shows him alone in the void, no sign of the huge satellite.
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.
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Moreover, Mark Pillow, who played Nuclear Man, claimed that working with Reeve was quite intense.