Revealing mistake: When the house has been locked down at the beginning of the film no moonlight could come in, however when the guests are being shown the coffin with the guns in there is a shaft of bright moonlight shining on to it.
House on Haunted Hill (1999)
Ending / spoiler
Directed by: William Malone
Starring: Famke Janssen, Geoffrey Rush, Taye Diggs, Peter Gallagher
Everyone dies from a huge ghost of everyone that died in the building, except Taye Diggs and Ali Larter. Chris Kattan's ghost helps them escape right in the nick of time. They both end up on the roof and find all the checks. Taye Diggs and Ali Larter were the only ones not related to people that died in the building years ago.
ugly bob
More mistakes in House on Haunted Hill
Evelyn: You know if you really love me, you'll find a way to drop dead in the next three seconds.
Stephen Price: Finding ways for me to die is really your deal, isn't it Eveline? Let's not forget the OJ knife with the not-quite-retractable blade. Your Jim Jones Kool-Aid was exactly that.
Evelyn: Accidents, all accidents until proven otherwise.
Trivia: The Terror Incognita roller coaster is actually The Hulk roller coaster in Universal Studios, Orlando.
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.