The titles of the Mark Caine books often consisted of four short words, in the manner of some of Ian Fleming's James Bond novels.

The Mark Caine title mentioned most often in the series was Index Finger Left Hand; another was To China Yours Sincerely (parodying Fleming's From Russia With Love).

Subsequent episodes featured Wyngarde playing King trying to write his novels and being pressured by his publisher Nicola Harvester about deadlines.

King's choice of fashion was named by Mike Myers as an inspiration for his popular movie character Austin Powers.

Wyngarde said in a BBC television interview when this episode was originally transmitted that he was flattered by the affectionate parody, but insisted that Jason King would never wear crushed velvet.