- Plot holes: When telling the story about the Sleeper, it was said and shown that he had bitten his tongue when he was a child. At the end of the movie he is speaking without any problems, which is impossible without a tongue. The same things happens with Peter, who also bit off his tongue when he was possessed by the Sleeper. Later in the movie, when he is lying on the floor, dying, he speaks normally.
- Continuity: When the man in a "coma" is strapped to the chair; and he is shown at a full body shot, the strap around his neck only covers his neck and does not cover his chin. When he is shown with a close up of his head, the strap covers is neck and his chin.
- Continuity: When Bug rips out all the tubes and leads connected to the sleeper as he backs out of the door the EEG leads are still connected to the sleepers head in the next shot when Jay looks back at the sleeper the leads have been disconnected. In the next shot of the sleeper where he stirs to indicate he's not dead, you get a shot of the EEG recorder showing brainwave activity yet the shots of the sleeper show that there are no EEG leads connected to him.
- Continuity: While Jay re-tells the story of the Demon to Holly, when the camera pans out from the top of the special tank, you can see that it’s empty and the door is closed instead of open when Holly comes in.
>>> WARNING: Here Be Spoilers <<<
Goofs below here contain information that may give away important plot points. You may not want to read any further if you've not already seen this title.
- Revealing mistakes: SPOILER: When Jay tries to save her brother from dying, she gets his blood on her shirt. The amount of blood changes tremondously between shots where she gets up to bang on the door then dropped down to the floor.
- Continuity: SPOILER: When Peter is possessed and he brings Josh to the tank area and makes an eye on his forehead with Josh's blood. Several shots later his forehead is completely clean, then bloody again.
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