Hetty [ to Geoffrey and Robert ]: There's nourishment in hot pot. If you were on a desert island, you'd be glad of it.
Dominic Monaghan (Geoffrey) would later play one of the leading characters in Lost, in which a group of people get stuck on a (seemingly) deserted island.
When Hetty and Geoffrey are investigating Michael's flat, you can see a 'Lord of the Rings' poster hanging on the wall beside the skeleton painting. Later on, in a close-up of Geoffrey, there is another in the background, this one of Treebeard, Pippin and Merry (the character Monaghan would go on to play in The Lord of the Rings).
Possibly due to the heavier nature of the storyline, PBS did not air this in its "Mystery!" rotation. The episode can be found in its entirety on the Season One DVD and the Season One VHS sets.