Although he is heartbroken when Claudine dumps him, Morse puts on a brave face to Joan Thursday and says, "You know me - easy come, easy go" - exactly like Jack Lemmon in the 1960 film after the Shirley Maclaine character has left his apartment.
Fenix's deadly pet - the "estuarine snakefish" he keeps in a tank in his office - echoes the Siamese fighting fish found in the aquarium in Ernst Stavro Blofeld's headquarters in the Bond film.
When Morse goes to Claudine's flat and finds her gone, she has taken everything of hers out of it, and even the sheets on the bed. This is a small-scale version of the famous scene in Stanley Donen's film where Audrey Hepburn returns to her luxurious Paris apartment and finds that it has been stripped bare in her absence.
Discovering Morse's investigations have led him into the murky world of espionage, Thursday mutters, "This isn't 'Danger Man', you know". Patrick McGoohan's TV show had aired on British TV only a couple of years before this episode is set.