About halfway through Aunt Alice is seen reading the novel'The Widow's Cruise' by Nicholas Blake. Nicholas Blake was a pseudonym of Cecil Day-Lewis, who was a Poet Laureate of the United Kingdom and the father of actor Daniel Day-Lewis.
Dr. Warnford's auto (rightly remarked upon in the episode) is an Aston Martin DB6 coupe: a classic: just 1788 were produced between 1965 and 1970.
Caroline John Florist is best known for playing companion Liz Shaw to Jon Pertwee doctor in Doctor Who.
Georgine Anderson plays Madge Fielding in this episode. She returns in episode 10.1, Dance with the Dead (2006), in the role of Rosemary Wood.