After twelve Carry On films and various other comedy releases with Anglos Amalgamated, Peter Rogers was forced to look for a new distribution company. The Rank Organisation proved willing. Legal questions over title ownership and Rank's concern over inheriting a rival's brand name led to the abandonment of the Carry On prefix from this opening venture. In a post-production meeting in February 1967 Rogers commented that: "as the film was more visual than previous "Carry On" productions it could stand on its own without any reference to 'carry on'." Still, Rank were mindful of the success of the series and considered the release as "virtually the thirteenth "Carry On" film". The poster tagline, 'Carry On Laughing Until You Have Hysterics But Don't Lose Your Head' was used as a conscious link with the past and won over earlier suggestions including; "that "Carry On" team has the French Revolution in Convulsions" and "Carry On Tumbrils - they're the new rescue squad of the French Revolution." The American release removed all confusion and simply re-titled the film Carry On Pimpernel.
Sidney James and Jim Dale came up with the gag where a messenger is told to drop the message in to the basket and the Duc will read it later.
Diana MacNamara is Charles Hawtrey's stunt double in the film, and also plays the role of Princess Stephanie/woman at guillotine/double of a soldier on horse/double for Hawtrey on horse.
The chateau used in the film at the end was Waddesdon Manor in Aylesbury. Built for the Rothchild family it is the only genuine French chateau in England.