THE HOUSE OF EXORCISM is what happened when the original, truly surreal horror film from Director Mario Bava, LISA AND THE DEVIL failed to turn a big profit. It was reworked, with extra scenes added / insinuated into the film. These scenes, starring Robert Alda as Father Michael, are about Lisa's (Elke Sommer) being possessed by a demon.
Of course, this had nothing whatsoever to do with the original movie, so new scenes of Lisa spouting obscenities, going bug-eyed, foaming at the mouth, spewing the obligatory green stuff, and contorting her body are inter-cut with the genuine footage from Bava's classic. The result is... bizarre.
Fans of LATD will watch agog, as their beloved film is edited, annihilated, and continually interrupted by what amounts to an unintentional parody of THE EXORCIST. This was obviously due to the huge popularity of that movie in the early 1970's. It's sort of like what might have happened if someone had decided to turn Hitchcock's PSYCHO into a comedy about motel management!
THE BURNING QUESTION: How was Ms. Sommer lured into trashing her own film, and making such a spectacle of herself in the process?...