Superman IV: The Quest for Peace (1987) - 30 major 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 the truck is carrying the missile, the officers parading in front of it pass by the same place twice.

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

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

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.

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

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

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

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: 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.

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.

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: When Superman lands Lex on the quarry, the standing position of the prisoner behind differs between shots.

Continuity: In the quarry, the cop on the right's hat has two strings around the top, the upper one dissapears depending on the shot.

Continuity: After Superman straightens the US flag, a brief shot shows he is on a plain ground, but when he is knocked down by Nuclear Man, a big mount appears in front of him.

Continuity: Before Superman enters the UN hall, the amount of people by the staircase changes between shots.