Superman IV: The Quest for Peace (1987) - 267 mistakes

Visible crew/equipment: When Superman and the super villain are fighting on the moon, when Superman flies in and lands at the beginning of the fight, you can see the cables that are suspending him.

Factual error: The Sun Man takes the publisher of the newspaper out into space. Humans cannot breathe in outer space. Even if they could, wouldn't she burn up in re-entry? It can't be Superman's powers are transferred to someone he's touching, otherwise in the second film he could never have crushed General Zod's hand...

Continuity: 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: When the truck is carrying the missile, the officers parading in front of it pass by the same place twice.

Continuity: Two firemen are seen away from their truck, but when the angle changes six firemen have appeared seemingly from nowhere.

Continuity: When Nuclear Man arrives on Earth, he enters a shady place which makes him loose his power and cools his body, producing some frozen-like smoke. The next two times that he enters a dark place (inside the elevator and in space) he doesn't produce the smoke. FX budget problems here?

Continuity: Nuclear Man dents the floor with his footsteps, but in a wider angle the floor is intact.

Continuity: During the Great Wall of China scene, the sky changes from cloudy and grey in the shots involving people, to bright and sunny when the wall explodes.

Continuity: While the people in the village are watching the lava flow down the streets, the first shot shows them to the right of a wooden door. A frame later they are positioned several feet further, close to a big green plant.

Revealing: When Superman saves the people that Nuclear Man throws up into the air, as they lower you can see the support wires holding them up.

Continuity: The debris on the bottom of the Statue of Liberty's base appears and disappears between shots.

Continuity: 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: After the two police cars are sent backwards, a third one that was parked behind, suddenly appears aligned with the other two.

Continuity: In the barn, Superman puts a glowing crystal inside a pocket. A frame later it disappears.

Continuity: When Lacy is in outer space grabbed by Nuclear Man, she slides down dramatically and grabs on his wrist. Half a second later, the sliding effect is gone and she is now floating relaxed, grabbing the upper part of his arm.

Plot hole: When NuclearMan sees a picture of Lacy Warfield on the newspaper he decides to go after her. When confronted by Superman he asks "Where is the woman?" Superman responds that he'll never find her. How could Superman know which woman NuclearMan was talking about? There was no indication that Superman knew that NuclearMan was looking for Lacy.

Continuity: Whenever there is a shot of Superman flying taken from directly in front of him, against a blue screen (watch out for the oh-so-visible black outline and loss of colour), it's always the exact same shot. Obviously the producers could only get one day with the blue screen, then.

Revealing: When NuclearMan goes to destroy the Great Wall of China, there is a brief glimpse of him wearing support wires.

Revealing: Watch the moon fight between the two supermen. In one scene, Superman charges nuclearman and you can see the backdrops flutter if your monitor brightness is high.

Continuity: 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.