George Cowley's nickname was "The Cow" and his car's license plate started MOO.
Guest star Diane Keen had previously appeared with Lewis Collins in 19 episodes of TV comedy The Cuckoo Waltz (1975) where Collins played Keen and her husbands lodger.
Diane Keen and Michael Latimer had also just appeared together in "Sweeney:The Movie".
This is arguably the bloodiest episode of the entire series. A pool of blood is very briefly visible in the pre-credits sequence when the shot policeman rolls over, and later on when the golfer is shot with a dum-dum bullet, there is a very large and bloody exit wound in his side/lower back. A blood squib is also used in the episode's climax.