In his book "Diaries 1969-1970 The Python Years", Michael Palin records a visit to Pinewood Studios on April 24th 1970 with Terry Jones to discuss rewriting the screenplay of "Percy" for producer Betty Box and director Ralph Thomas. Palin and Jones finished their rewrites on May 22nd, while filming location scenes for the TV show "Monty Python's Flying Circus". The film was released in February 1971 but neither Palin nor Jones received an on-screen credit.
The first movie to be legally restricted to adults in Australia when new film censorship standards were introduced in 1971.
It was written in the script there would be a This Is Your Life (1955) spoof but copyright problems and legal issues led this idea being dropped.