The story of "Lisa and the Devil" is the stuff of movie legends: riding high after the success of Baron Blood and A Bay of Blood, the iconic horror director Mario Bava was given free reign for his next project: the surreal "Lisa and the Devil". Sadly, "Lisa..." flopped at the box office in Bava's native Italy and desperate to sell it overseas, the film's producer basically butchered the film in an act of cinematic murder. The film's ending was removed, new footage of lead actress Elke Sommer was shot with actor Robert Alda, that basically turned the film into bastardized rip-off of the Exorcist, with the remaining footage recast as an extended flashback sequence about Sommer's characters being possessed.
For decades, the removed footage was considered destroyed until they resurfaced late in the 1990s, at which point the restored "Lisa and the Devil" was resurrected. The film's reputation, having grown over the years due to the butchery done to it in the name of making it more "commercial", was reappraised and it has since been seen as one of Bava's best films.
The Blu-Ray includes both cuts of the film, but trust me when I say you should stick to the original cut and shun "House of Exorcism".