- This was the first British film to be labeled "horrific".
- This was the first British horror film of the sound era.
- For years this was regarded as a "lost film" with no prints or elements known to exist. A nitrate release print was discovered in the Czech National Archives in Prague. This print was a subtitled edited version that was in poor condition and contained numerous splices. Years later, a print of the uncut British version was finally discovered.
- Some U.S. theatre prints were shown in spherical widescreen. The movie wasn't shot in widescreen. The bottom of the screen had been matted to cover up the Czech subtitles (present on the only known existing version at the time) thereby creating the rectangular widescreen shape.
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