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Revealing mistake: When Supergirl is flying to Earth, part of her head disappears due to the blue screen used. Also, some sides of the spaceship either disappear or become transparent.

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Continuity mistake: Supergirl arrives on earth, lands in a forest in broad daylight, walks four steps and when she stares at a lake it's suddenly dusk light.

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Continuity mistake: When Jimmy brings the onion rings, the guy on the left swaps between having his arms down to crossed, between shots. (00:54:32)

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Continuity mistake: When Supergirl flies over the field with the horses galloping below, the horses disappear in a couple of wide shots of her.

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Continuity mistake: When Selena toys with the Omegahedron and it goes berzerk, she and Bianca hug. The position of her arms isn't continuous in any of the shots.

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Continuity mistake: When Selena's car arrives at the campus she is not in the car. A shot later she appears inside.

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Continuity mistake: Inside Selena's car, the first shot of the Omegahedron shows her thighs and the book on her lap. In the following shot Selena and the book vanish.

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Continuity mistake: When Selena plays with her Tarot cards, the one on the far left corner has a round square drawing on the base. In the close-up it's a different card.

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Continuity mistake: After the hockey ball crashes against Supergirl's back, a girl with glasses staring at her is holding her hockey club. A shot later her arm is raised.

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Continuity mistake: When the school bus arrives at the campus there are only 3 or 4 girls inside. From the shots inside Selena's car at least 9 girls leave the bus.

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Continuity mistake: When Supergirl is kicking the truck guys' asses, the big one has long hair, but in the angle from behind, right before she kicks him, his hair is short. (00:24:35)

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Continuity mistake: When Supergirl heats the monkey wrench, it swaps positions between shots.

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Continuity mistake: At campus, Supergirl holds the road map with her left hand on the side of it. A frame later it lays on the middle of it.

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Continuity mistake: When the red haired girl is breaking the pipes, the nerd behind hair has a couple bangs of hair on her forehead, or a lot, depending on the angle.

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Other mistake: The very last scene of the movie shows Supergirl flying underwater holding the Omegadron. Oddly enough, though her body is realistic, her arms are now very thin and measure two meters long.

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Continuity mistake: The hole that Supergirl makes in the water tank changes shape between the close and wide shots.

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Revealing mistake: When Supergirl is about to fly through the water tank to extinguish the fire, note the patch on the tank where the hole later appears, painted on a darker grey colour.

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Revealing mistake: During the bulldozer scene, the truck loaded with hay skids on the road. Skid marks from previous takes are visible, and their colour also changes intensity.

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Continuity mistake: When Supergirl runs inside the diner to change into her super outfit, the two girls next to the bathroom door disappear between shots.

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Revealing mistake: Right after Supergirl saves Lucy in the bulldozer and dismounts its front part, when she is about to land in the yard to save Ethan, wires holding her are visible.

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