Phyllida Law and her daughter Sophie Thompson (the mother and sister, respectively, of Emma Thompson) appear together as Mrs. Llewelllyn-Smythe and Mrs. Reynolds.
The fourth feature length episode to feature Ariadne Oliver. It is highly likely that Agatha Christie created her as a loving spoof of both herself, and other "lesser" authors.
Fenella Woolgar, who plays Miss Whittaker in this episode, previously had a small role in the episode Lord Edgware Dies (2000) and also played Agatha Christie herself in an episode of "Doctor Who" The Unicorn and the Wasp (2008).
The soundtrack music over the closing credits is an arrangement of the Poirot theme incorporating a violin line strongly reminiscent of Saint-Saëns' 'Danse Macabre', which viewers may recognize as also being the theme music used for the series Jonathan Creek (1997).
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