- An alternate version was supplied for drive-ins. For this version, only the footage of 'William Castle (I)' was different. For the drive-in version, instead of the "Punishment Poll" cards, the audience was asked to flash their headlights to vote on the ending. The Columbia exchanges could replace the two William Castle segments to make an existing print suitable for drive-in bookings. As with the theater version, there was only one ending filmed.
- The film was initially refused a UK cinema certificate by the BBFC, and only passed 4 months later after considerable pre-cuts which included shots of Sardonicus' face and the entire leech torture of Anna. The 1996 Encore VHS release was complete and uncut.
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