Sean O'Connor, who has chauffeured David Suchet to the set since the first season, makes an uncredited appearance as a driver.
The character name 'Gallaccio" is homage to producer George Gallaccio.....Bergerac, Alleyn Mysteries, and many Agatha Christie mysteries. And George Gallaccio has a daughter who is an artist and sculptor.
Susannah keeps referring to Bechuanaland in Africa, now known as Botswana.
John Carson (Richard Abernethie) also played Sir George Carrington in The Incredible Theft (1989) (1989)
David Suchet and Geraldine James appeared together in Blott on the Landscape, 1985