Continuity mistake: By the colour of the new stones repaired, you can tell that the first gap that Superman fixes at the Great Wall is smaller in size and triangular shaped, instead of the original rectangular and huge gap made by Nuclear Man.
Continuity mistake: When Superman and Lois are flying together, the train below drives from right to left, but half a second later it is moving in the opposite direction.
Continuity mistake: After Lois and Clark read the headline with the "Drop dead" to kid, shots alternate between each of them and there's no sync in the graphics appearing on the computers behind each, while for the rest of the whole film all computers are in sync.
Continuity mistake: After the volcano erupts, a big black cloud covers the city, but a wider angle shows the sky clear.
Continuity mistake: After nuclear Man crumples the cab's hood, there's another taxi behind starting to drive slowly towards the damaged cab. A frame later, a new angle shows that taxi repeating the previous movements but really fast.
Continuity mistake: The SWAT van is lifted next to the curb, but a second later appears in the middle of the street surrounded by cars.
Continuity mistake: Luthor extends his arm with a dollar bill in hand for Nuclear Man to light. From the front his arm is fully extended. From behind it isn't.
Continuity mistake: When the SWAT van is turning around, the cars on the street are different than the ones in previous shots (try to find the destroyed taxi cabs that collided).
Continuity mistake: When Nuclear Man is thrown down the chimney, he is unconscious with his arms and head looking down. A frame later he is stiff, with his arms up and pointing to the sky.
Continuity mistake: When the crowd follows Superman to the UN the mounted cop changes from being on the left side to the right.
Continuity mistake: When Nuclear Man walks towards the newspaper on the desk, the phone cable's position changes through shots.
Continuity mistake: Superman crosses flying the Golden Gate Bridge together with Lois, heading close to the bay area. Half a second later they are next to the bridge again.
Continuity mistake: When Superman stops the subway train, there's a black man with a moustache, red shirt and a gabardine suit in the first line. Then he manages to appear meters behind, despite the jam on the platform. Then Lois appears behind him. Then she magically disappears and he appears back on the front.
Continuity mistake: Lois hands the newspaper to Clark, with the headline "Superman says drop dead to kid", and a guy in a red shirt in the background stands up and leaves, followed by a bunch of people behind; in the following angle he is sitting down and the whole choreography is repeated.
Continuity mistake: After Clark takes the green crystal from the hole on the ground and hides it, the cloth covering the hole has a different position to how it looked a second before.
Continuity mistake: When Superman is out on the balcony with Lois, a tall, wide building is reflected on the glass behind, but when the angle changes to Superman's POV the building is gone, and now there's just a vast open space and a thin skyscraper.
Continuity mistake: When the Soviet missile is about to be launched, the sky changes from daytime to dusk.
Continuity mistake: Before Nuclear Man burns Luthor's dollar bill, Luthor looks to his right, immediately after, the shot from behind shows him looking straight forward.
Continuity mistake: During the volcano scene, a girl is holding on to the priest's arm at wrist level. A split of a second later her grip changes to above the elbow level.
Continuity mistake: When the window shops explode, the grey car close to them disappears in the following shot.
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.