- The original UK cinema version was heavily cut by the BBFC with edits made to closeups of throat slitting and repeated stabs during the telephone murder, the pick axe killing, and axe blows (including blood frothing from a man's head) during the climactic flashback. The film was then listed and banned as an official video nasty, and a successful prosecution was brought against the distributing company World of Video 2000 in 1984 for releasing an unauthorized video version (which was 1 min longer than the cut cinema print). The film was finally granted a video certificate in 2002 though the print submitted was an edited U.S version, which restores the ice pick murder and around 1 minute of dialogue scenes but still has edits to the throat slashing/stabbing scene and some brief cuts to the climactic flashback nightmare murder.
- Released theatrically in unrated and R-rated versions. The unrated version is the version available on all home media releases.
- The Australian video release of "Nightmare" under the name "Schizo" runs 89 minutes, and is missing most of the bloody moments, including the final axe murders and all parts involving the young George Tatum being covered in blood.
- The complete and uncut version of Nightmare is also available on video in Australia. Unlike Schizo it is under the original title and runs for 100 minutes. It is distributed on the Video Classics Gold label and is also Rated R. Interestingly there is fractionally longer dialogue sequences than in some other uncut prints.
- All the explicit gore was cut from the U.S. release to earn an "R" rating instead of an "X". The uncut version is available on video unrated.
- Originally banned in the UK as a result of the 'video nasties' frenzy, the film has been passed uncut the BBFC in 2002; this UK version however appears to be based on the R-rated US version and is not uncut.
- In Germany , the film has been released uncut on DVD from Laser paradise in its Blood Edition.
- Dutch video version is missing the dead body scene (97 min) as is the Australian video version (not the "Schizo"-Tape)
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