The film's third segment, "Bobby", was later remade as the second segment of Trilogía del terror II (1996), another horror anthology film that was directed by Dan Curtis just as this film was and the first film in the series, Trilogía del terror (1975), had been 22 years earlier (with that first film originally released two years before this one).
The incidental music at the beginning of the film is borrowed from Dead of Night: A Darkness at Blaisedon (1969), what was supposed the pilot for a horror TV series with the same name as the film that was produced by Dan Curtis in 1969, but was never released as such. This pilot was officially released for the first time ever as a bonus feature on the film's DVD release by Dark Sky Films in 2009.
Both the film Trilogía del terror (1975) and this film were the pilots for a horror anthology TV series that was also going to be titled "Dead of Night", but was never made.
The film's third segment, "Bobby", is a version of W.W. Jacobs' classic short story "The Monkey's Paw". Among the many earlier and later film and TV versions of this story was a horror film version of it made three years earlier that was originally also titled Dead of Night (1974) but is now better known by the title "Deathdream", which was directed by Bob Clark with a screenplay by Alan Ormsby, but without any mention of Jacobs' story being its basis. An earlier version of the story that aired as an episode of the anthology TV series The Alfred Hitchcock Hour (1962) titled The Monkey's Paw--A Retelling (1965) did give proper credit to Jacobs for the original source material and featured Lee Majors in one of his earliest screen roles as the son wished back from the dead with tragic results.