Referring to Wimbledon supporters, Mrs Godber says, "It's been beyond all since that Fred Perry won again." Poirot later mentions that the fire is unlikely to be lit in July. These comments indicate that the episode takes place in either July 1935 or July 1936 as Perry won the Wimbledon men's singles event for the second and third times in those years.
Frances Barber appears here as Lady Millicent, and 19 years later in the fourth episode of series 12, The Clocks (2009), as Merlina Rival.
On the UK DVD version, this episode as part of season 1; however, due to the way the episodes were rearranged, it appears with the cast list from a completely different episode shown at the end.
As the original 2 part episode 1, is usually presented as a 2 hour tv movie version, as part of the later 2 hour movie length episode run, this original series 2 episode 2 is retro-fitted as series 2 episode 1 as part of the 9x1 hour run.