Shot over two weeks, filming solidly every day from 10:00am until midnight. To save money, director Norman J. Warren also edited the film.
The score, composed by John Scott, was recorded in a single session with seven instrumentalists - the largest ensemble that the budget would allow. It features a clarinet and various gong effects, supported by a piano, xylophone, xylorimba and vibraphone.
Daniel Ollier's voice is dubbed.
After eight years in the film industry performing various production roles, director Norman J. Warren wanted to direct. He'd made a couple of 16mm shorts, but needed something to show producers, so he made the short Fragment (1966) on higher quality 35mm. He took it to all the independent distributors and independent theatre owners in town, until a man named Richard Schulman said he would show it at the London cinema he owned. One day, Schulman was talking to independent distributor Bachoo Sen about going into production themselves when Sen noticed Fragment playing on the screen. Since they needed a director, Sen said "Why don't we give him (Warren) a call?" So they called him and offered him the opportunity to make films. He ended up directing Her Private Hell (1968) and Loving Feeling (1968) back to back.