An article about Peter Cook that appeared in the New Yorker stated that the filmmakers didn't have a title for Bedazzled (1967) when it was being made. Cook suggested calling the film Raquel Welch. The producers didn't understand why Cook would want to name the movie after an actress that only appears for a few minutes in it. Cook explained that movie marquees put the lead actors names over the movie title. Thus the letters on the marquee would say "Peter Cook and Dudley Moore in Raquel Welch". The producers ended up going for the more ordinary title.
Dudley Moore adopted the moniker Stanley Moon in this film after John Gielgud wrote him a letter of introduction because he was impressed with Moore's work in the stage revue "Beyond the Fringe". Gielgud obliviously referred to Moore as Stanley Moon in the letter, and an amused Moore adopted the name as an alter ego for the rest of his life. After they worked on Arthur (1981) and Arthur 2: On the Rocks (1988) together, Gielgud good-naturedly said that he "got to know Stanley Moon rather well."
At the time of its release, blasphemy was considered a common-law offense in the UK, and the British Board of Film Censors were concerned that the film's premise would offend religious groups. Stanley Donen defended the film against such claims. To prove his point, Donen claimed that he pre-screened "Bedazzled" to a London rector and the Arch Deacon of Westminster Abbey, both of whom took no offense to the film. After that assurance, the case was dropped. By 2005, standards about what could be considered blasphemous in Britain had been relaxed, that when the film was resubmitted to what was now called the British Board of Film Classification, the only problem they had was with a particular scene involving Stanley's hanging attempts, which had the potential to be considered a glamorous depiction of suicide (the solution was raising the film's previous "PG" rating to a "12").
When George Spiggott says to Stanley Moon that the sins who worked for him performed their duties poorly because of the wages, he was alluding to Romans 6:23, which reads "For the wages of sin is death, but the gift of God is eternal life in Christ Jesus our Lord."