Trivia: Barry Bostwick and Susan Sarandon actually were a couple at the time the film was made. 20th Century Fox wanted some Americans cast in the British production which is why they were hired. (Source: The Guardian).
Trivia: The iconic song "The Time Warp" was not in the original production of the show. It was added to pad out the the 40 minute play to feature film length, along with allowing a dance number to be added to the film. (Source: The Guardian).