When Arthur accidentally drives into the back of a car at the traffic lights (while kissing Florence), the driver of the car in front is the film's producer, Michael Medwin.
Hannah Gordon met her husband, the cinematographer Norman Warwick, (who was 21 years her senior) on this film, and they were married (shortly after production ended) in February 1970.
The writer/performer of the film theme song, Alan Price, a talented keyboard artist and film composer, was one of the founding members of The Animals.
The external shots were shot in Bolton in 1969 and the family house is 51 Grisdale Road. It was filmed whilst many of the old industrial buildings remained and as St. Peters Way was being constructed, and the film includes panoramic shots of an early stage of work on that part of the new road adjacent to St Peter's Church, where it follows the former course of the River Croal and the Bolton arm of the Manchester Bolton & Bury Canal. The movie was the first film shot at Elstree Studios after Bryan Forbes took over.
Although playing a son and daughter still living at home with their parents and younger siblings in 1969, Rodney Bewes and Hannah Gordon were 33 and 29 years old, respectively.