Miss Marple is shown reading Raymond Chandler's short story anthology "The Simple Art of Murder", which also contains his titular essay on the detective novel. In the essay, Chandler argues that, in real life, the most unsolvable murders are the simplest, and criticizes, among other writers, Agatha Christie for creating implausible, over-elaborate murder plots for her novels.
Final acting role of Herbert Lom.
This episode takes place in December 1915 and 1951.
Julie Cox (who plays a young Miss Marple), Marc Warren (who plays Captain Ainsworth), and Rachael Stirling (Griselda Clement) all appeared together in the Agatha Christie's Poirot episode "Five Little Pigs"
Mark Gatiss, who plays Ronald Hawes wears two different pairs of glasses during this episode and they change several times between scenes.