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Continuity mistake: When young Clark saves the school bus and is watched by Lana, his fringe swaps from being brushed to the right to brushed to the left, between shots. (00:27:55)

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Other mistake: When Superman breaks his ice cage and makes it explode, a long black rubber band flies away. Where the heck did that come from?

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Continuity mistake: When the volcano's lava floods the village, there's a wide shot of the mountains and the volcano and you can see that the lava is still running down the volcano, not near the village.

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Revealing mistake: When the volcano erupts and lava floods the village. The red truck on the left is a very obvious scale model prop: The engine is missing and the hood is attached to the grilles.

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Continuity mistake: The guy's whose head is put in a vice has a trail of blood running along the left side of his mouth which appears/disappears randomly between shots.

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Revealing mistake: When Nuclear Man melts the rifle, note that the SWAT member is holding the barrel and he slides his hand away slowly to make the barrel bend downwards. He was obviously holding it up. If he had burned himself he would've moved faster.

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Revealing mistake: When the fire truck explodes, note a tube behind it going straight to the truck. Probably an FX device to effect the smoke.

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Continuity mistake: When the firemen are about to grab the hose and it explodes, note that the other hose inside the truck on the right side has changed positions between shots.

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Continuity mistake: Nuclear Man walks towards the newspaper where Lucy's picture is, for a brief moment there's a light smoke coming from behind him as if something was burning (it has nothing to do with the smoke Nuclear produces when flying) which is later gone (according to SupermanIV.com a deleted scene involved Nuclear Man waking up, "he sees and picks up the newspaper with Lacy, which then catches on fire in his hand.").

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Continuity mistake: Before Nuclear Man see Lacy's picture in the newspaper, he rises from the floor and a wide angle reveals that the table is nowhere around, yet a couple shots later it simply appears half a meter away from him.

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Revealing mistake: When dying and balding Clark grabs the green glass, the border of his wig noticeably protrudes all around his face.

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Continuity mistake: When Lois visits sick Clark she stands by the door, fully lit, a frame later, when the angle changes, the whole place is in the shadows.

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Revealing mistake: When Superman discovers that Nuclear Man is stealing the Statue of Liberty, he turns around and you can see the wrinkles on his temple from the wig he was using.

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Continuity mistake: When Superman first meets Mr Warfield, the orange pencil on the table changes positions between shots.

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Continuity mistake: When Superman stops the train there are two thick black tubes next to the tunnel behind which disappear when he leaves.

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Continuity mistake: After Karen's been harassed by her neighbour, Henry drives her home and tells her to walk home. When Henry steps out, she's nowhere to be seen. She couldn't have walked all the way to the house in that short time. She couldn't have run, either, being as weary as she was.

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Continuity mistake: When Superman lifts the plane during the storm, after the pilot asks what's going on, the copilot glances at the window grabbing its side. From the opposite angle he is away, repeating all movements.

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Continuity mistake: Thing, Johnny and Reed are at the disco. Johnny steps forward and Reed grabs him and says "We had a deal". A frame later Johnny is not two meters ahead but aligned with Reed.

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Revealing mistake: When Johnny and Reed are talking about the bachelor party in the lab, they keep moving from one side of the table to the other: One side has a green book, the other a red one. Note the books behind Johnny and you'll notice by the colour and the reversed text that the shot's been flipped.

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Continuity mistake: Johnny chases the Surfer, who surfs down a building and shatters its windows and facade, yet none of the debris fall or even appear on the street in the next shots.

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