David Davenport worked 10 days.
Bernard Cribbins was asked to appear in the film but he chose to do a play instead.
Peter Jesson worked 6 days.
Although the script is credited to Talbot Rothwell, the most often quoted line ("Infamy, infamy, they've all got it in for me!") was supplied by the writing team of Frank Muir and Denis Norden,
As with many Carry On films the movie was cut by the BBFC for an 'A' (now PG) certificate. This included the removal of double entendre dialogue lines, including "backward people", "ants in his pants", and referrals to mutes as "having them cut out". Also cut was a shot of Mark Antony wriggling his legs on top of Cleopatra and a scene showing the exhausted Antony staggering from her bedroom. Although the latter scene was restored the rest of the cuts still apply to all releases of the film.
Filmed on the abandoned sets built in London for Cleopatra.
The film's producers lost a lawsuit brought against them by 20th Century-Fox after it was judged the movie poster, which parodied that of Cleopatra, was so similar as to be a breach of copyright.
The owners of the British department store Marks and Spencer were alerted to a send-up of their store's name ("Marcus and Spencius") and associated use of the store's colours (green and gold) and called in their lawyers. Legal action was averted when it was explained that no slight against the store was intended, and the owners settled for an apology and a letter of explanation to be sent to a leading newspaper. This idea was later dropped, however, and the incident forgotten.