Continuity mistake: When nuclear Man makes the engine of the taxi explode, there's a guy with a red jacket behind it that appears and disappears between shots.
Continuity mistake: Swat agents hide behind the van and start to shoot. A second later they've all vanished.
Continuity mistake: Superman walks towards the UN and there are benches in front of him. In the next wide angle they've disappeared.
Continuity mistake: When the train driver passes out, several (speeded-up) shots of the tunnel and the shots of the bystanders on the platform show that the train is moving really fast, but in between there's a shot of Lois at normal speed, and the lights of the tunnel seen through the windows show that the train speed is quite low.
Continuity mistake: When Nuclear Man destroys Metropolis, he stands by the Metropolis Tower entrance, but disappears and reappears randomly depending on the angle.
Continuity mistake: During the subway sequence, the carriage in front of Lois's is empty, but when the train comes to a stop it's packed with people.
Continuity mistake: When Clark is about to leave the hotel, a man appears by the dark car on the right in less than half a second.
Continuity mistake: When the bellboy picks up Clark with the baggage trolley, he makes a close turn to the right and drives parallel to the elevator. When the angle changes he is in a totally different position.
Continuity mistake: One of the general shots in the subway shows Superman flying slower than usual and inches away from the bystanders. The problem is that their coats and hair don't flutter nor do they notice him passing by or seem nervous in any way. However, the next close shot of their faces show them nervous and in awe at the action.
Continuity mistake: On the moon, nuclear Man grabs a rock with a huge hole underneath and holds it over his head. The angle changes and the rock has changed to a different one with a solid bottom.
Continuity mistake: After Perry White delivers his final speech a woman in a yellow dress goes up the escalator. In the following shot, no one's there.
Continuity mistake: While Nuclear Man is destroying Metropolis, two police cars get moved backwards. The first shot of the cars moving show a lot of people by a shop window. The angle changes to a close shot, with no people there, then back to the previous wide angle, now with the cars moving backwards, and the bunch of people reappear.
Continuity mistake: When the Soviets are about to launch the missile in the snowy field, there are two soldiers on the right and a third with a black hat running away. A second later there are three soldiers plus the one with the black hat who's now there.
Continuity mistake: Before the firemen arrive at the truck, there's a lot of smoke around, but half a second later it's all gone.
Continuity mistake: Before Lacy opens the red car's door at the UN, a lot of people walk towards her and stand inches away. A second later they've vanished.
Continuity mistake: While Nuclear Man moves the 2 police cars backwards, the first shot shows the car on the right ahead of the other. A frame later, in a new angle, it is way behind the other car.
Continuity mistake: After Lenny calls Nuclear Man "experiment freako", the stool from the drum disappears.
Continuity mistake: When Lois is walking towards the subway carriage there's a cop controlling the passers by. When Clark walks by two seconds later the cop is gone. The train starts to move and we get a panoramic view of the station and, yes, the cop has definitely vanished.
Continuity mistake: The tornado rips off the farm's roof, but it magically reappears with the house in perfect state after Superman arrives with the girl. He didn't have time to fix it. (Laserdisc and international extended editions).
Continuity mistake: When Luthor explains his plan to the three baddies the champagne bottle swaps between pointing at him or away. The glass next to the ice cube also moves nearer/further in different shots.
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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