Did You Know?
During the costume party, Robert Quarry is dressed in his outfit from the film "Count Yorga, Vampire" (in which he played the title role).
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Peter Cushing dresses as Dracula, an in-joke reference: he frequently played Van Helsing in Hammer's Dracula series.
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During the last scene and over the closing credits, it is Vincent Price whose singing voice we hear.
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The title has very little to do with the film. There is a brief scene in a mental institution; and we learn in some expository dialogue that the main character spent time there. Otherwise, the "madhouse" of the title is irrelevant.
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The Dr. Death movie clip played at the beginning of Madhouse is from the end of The Haunted Palace. The voices have been dubbed to fit with Dr. Death.
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