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Revealing mistake: In some extended edition cuts of the film, Regan backwards spider walks down a flight of stairs, and blood falls from her mouth. But her face isn't that of Linda Blair, but of a stunt double.

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Revealing mistake: When Regan meets Father Karras, she projectile vomits in his face. But if you look closely while this vomit happens, you can very easily notice that it is the stunt double.

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Revealing mistake: When Glenda is killing the mother in the shower towards the beginning of the movie the mother's underwear is visible through the shower curtain.

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Revealing mistake: When Louis sets Gage's lifeless body on fire, it becomes apparent that it is a stunt dummy. The body resembles a small, pale mannequin with vague facial features and a wig.

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Revealing mistake: When the headless horseman's head is being dropped into his grave it bounces on the dirt like rubber.

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Revealing mistake: When Kalidor lifts Prince Tarn into the air with one arm, the cables attached to Tarn's back are visible.

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Revealing mistake: When the High Priestess gets hit by Ikol's Shuriken star the guiding wire for the projectile is visible.

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Revealing mistake: Sonja has a modern vaccine scar on her left shoulder.

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Revealing mistake: When Joe Dirt gets lifted up by another man and thrown to the ground you can see that Joe is a stunt double.

TerrenHurley

Revealing mistake: When Louis gives Gage the lethal injection, because the syringe is transparent you can actually see the prop needle retract in and out of the syringe as he supposedly injects Gage.

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Revealing mistake: After Steven Wilkins disguised as a vampire kills the unnamed woman he closes her eyelids to make it look like she's asleep. Just before his hand contacts her eyelids you see her almost blink, revealing she's very much alive.

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Revealing mistake: When Tommy Ross gets killed and Carrie looks at his supposedly lifeless body if you look closely you will notice he blinks revealing that he is actually alive.

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Revealing mistake: When Henry hits one of the corrupt cops in the head with an otoscope it bends off his head like rubber.

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