Superman IV: The Quest for Peace (1987)

Continuity mistake: The smoke coming out of the volcano changes direction in a split second after nuclear Man enters the crater.

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Continuity mistake: In the quarry, Lenny parks his car to the very right of two wagons. Seconds later the car is in front of them.

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Continuity mistake: When Superman is rebuilding the Great Wall all of the people near the hole vanish.

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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.

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Continuity mistake: Swat agents hide behind the van and start to shoot. A second later they've all vanished.

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Continuity mistake: Superman walks towards the UN and there are benches in front of him. In the next wide angle they've disappeared.

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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.

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Continuity mistake: When Nuclear Man destroys Metropolis, he stands by the Metropolis Tower entrance, but disappears and reappears randomly depending on the angle.

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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.

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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.

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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.

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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.

Sacha

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.

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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.

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Revealing mistake: When Lois and Superman are flying together, they turn green, specially Lois's arms and hands.

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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.

Sacha

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.

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Revealing mistake: Outside the UN, a woman in a red coat appears behind the hot dog stand and when the angle changes to the opposite side, in front of her, she's also there.

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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.

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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.

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