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."
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