Last TV role of Joan Greenwood.

Miss Marple is directed to the "television room" which is said to be "tucked well away" and that "the Americans like it" as if no proper English person would watch. In fact, the BBC is credited with the world's first regular television service with high-level image resolution, starting 2 November 1936.

The song on the radio at the diner is 'Rock With the Caveman' by Tommy Steele.

Joan Greenwood (Selina Hazy) appeared with another famous portrayer of Miss Marple, Margaret Rutherford, in the 1952 film version of The Importance of Being Earnest.