The first of the "portmanteau" horror movies to be made by Amicus Productions. According to co-producer Milton Subotsky, he was inspired to write a multi-story horror movie by his admiration for Ealing Studios' Dead of Night (1945), which used a similar format. Indeed, Dr Shreck's opening line ("Pardon me, I think there is room for one more in here, is there not?") echoes the earlier film's celebrated line "Just room for one more inside, sir!"
When Biff Bailey is seen running in fear down a street, he passes a cinema with a poster advertising "Dr. Terror's House of Horrors", which instead of a cast lists several characters from the film such as Sandor Shreck, Franklyn Marsh, and Sammy Coin (also Biff Bailey).
Faith Kent and Phoebe Nicholls were real-life mother and daughter, although they appear in different segments of this movie.
Roy Castle buys a packet of cigarettes and immediately puts them in his pocket. This is because Roy Castle was a life long non-smoker. Ironically, he died of lung cancer, probably from secondary smoke after a lifetime in jazz clubs.