For much of his role as Bill Crichton, Kenneth More was filmed from the waist up to hide the fact that he was wearing shorts with his dinner-jacket because of the heat during filming.
The film was released in the US as "Paradise Lagoon." The distributors feared that if they used the original J.M. Barrie title the public would think the film was about a naval officer.
The film was adapted into a musical entitled "Our Man Crichton" which premiered in London on December 21, 1964. Kenneth More repeated his film role of Crichton in the musical version.
The original Broadway production of "The Admirable Crichton" by J.M. Barrie opened at the Lyceum Theater on November 17, 1903, ran for 144 performances with William Gillette {famous for his Sherlock Holmes plays and portrayal} in the title role. The play was revived on Broadway in 1931.
The Red Dwarf robot/android "Kryten" was named after the butler, Crichton (the SF robot has the same name, but this time phonetically).