Continuity mistake: At the start of the film when we see Pritchett shake hands with Blackburn, in this shot we can see that Eddie is standing in front of Blackburn and slightly to the side of him, yet in the following shot Eddie is nowhere to be seen, and the shot after he is back in front of Blackburn. (00:13:40)

House on Haunted Hill (1999)
21 mistakes
Directed by: William Malone
Starring: Famke Janssen, Geoffrey Rush, Taye Diggs, Peter Gallagher
Melissa Marr: Now, that's enter-fucking-tainment.
Trivia: The darkness that emerges and begins to kill the guests was actually created when the animators took film of dancing naked women and mirrored the image over and over.
Question: Who exactly is the person that Melissa sees behind her before it attacks her?
Answer: Just a generic ghost/monster as it has no face.
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Answer: The ghost that kills Melissa is the patient Vannacutt was dissecting. When Melissa initially sees them through her camera, what she's really seeing is the ghosts re-living their last moments.