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Revealing mistake: As the Batmobile approaches the camera on the pier, the tire tracks from a previous take are visible on the deck boards, and as the Batmobile nears, it follows the tracks precisely.

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I, Mudd - S2-E8

Revealing mistake: After making the Alice androids freeze up, Spock returns to Kirk. As he does, look at the rock wall behind him; the seam between the panels is obvious.

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Datalore - S1-E13

Revealing mistake: As Lore kneels over an unconscious Data, the person on the floor is a body double.

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Datalore - S1-E13

Revealing mistake: After Data leaves Lore in his quarters, as the doors close, the grain of the wood is plainly visible in the strong lighting. The doors were supposed to be a sleek material.

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Revealing mistake: As the sweeps dance and jump from building to building, the edges of the matted in street that hides the sound stage floor is easily discernible.

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Revealing mistake: In the scene with the three chimneys, the sweep coming out of the middle chimney can be seen actually coming up from behind it, as his arms going up are visible.

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Revealing mistake: After Bert pulls up his pants to bring the dance challenge to an end, as he walks to the other side of the clearing, both he and the background can be seen through the penguins.

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Revealing mistake: As Mary and Bert sit at the Penguins' tea tent, when Bert calls for the waiter, the background shows through his head, revealing the live action matted in over the animation.

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Revealing mistake: As the turtle closest to the camera struggles with Bert's weight, Mary's heel clips through the turtle's beak. Also, though a combination of animation and live action, neither Bert or Mary has any kind of reflection on the water, real or otherwise.

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Revealing mistake: When Mary Poppins goes to bring out the hat stand and the mirror, you can tell that the underside of the table is masked with a overlap of the background to make the illusion complete. Also, when she pulls out the mirror, watch the table leg closest to her, and the bottom of the mirror pass, because the illusion is not quite far enough to cover it.

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Encounter at Farpoint (1) - S1-E1

Revealing mistake: When Q freezes Torres on the bridge, it is easy to tell that directional hoses were used for the effect. (00:06:25)

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Revealing mistake: As K walks out from the car, saying "INS, Division Six", look at the road they just drove up. It runs a short distance, and ends at a hill of dirt. Presumably, the pile and the end of the road are at the sound stage wall.

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The Return of the Archons - S1-E22

Revealing mistake: In the holding cell, as Spock attempts to analyze McCoy's mental state, the alcove is brightly lit a hand held lamp. As the camera pulls back, the light is seen to move, and then is turned off.

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Revealing mistake: After the Mariner has Enola, the Deacon and his goons collide. In slow motion, the three of them are exploding a split second before the collision, and they're several feet from each other.

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Revealing mistake: As the command post is engulfed by fire, one (stuntman) soldier comes crashing through and over a table. As he does, the gloves he wore to protect his hands during the fire scene are visible. Nobody else was wearing gloves. (00:38:00)

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True Q - S6-E6

Revealing mistake: On the bridge, Data is reporting to Picard some info the captain wanted. As he does, the dome over the Captain's chair is totally devoid of stars, where other episodes have had stars showing through.

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True Q - S6-E6

Revealing mistake: In Amanda's quarters, when she repulses Q, as he flies toward the corner, you can tell it is his stunt double.

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True Q - S6-E6

Revealing mistake: In the cargo bay, as Riker stands alone, through the whole scene where a case is about to hit him, you can tell it's a stuntman with a bad wig.

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Revealing mistake: After the machine runs over the terminal, killing him, when the camera shows the legs being run over again, it's easy to tell that they're dummy legs.

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The Squire of Gothos - S1-E18

Revealing mistake: As Kirk turns to run on the castle steps, an iron bar barricade appears, blocking his path. When it does, watch the castle wall, and the barricade. It seems to slide just a few inches to line up correctly in the shot, showing poor editing.

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