As Lewis walks along a river near the start of the episode, he mentions that one of his first cases occurred nearby and involved a woman who hanged herself in her kitchen. This is a reference to the very first Morse episode: The Dead of Jericho.
The quotation cited during the episode--"Whom the gods would destroy, they first make mad"--was first spoken in English by Prometheus in Henry Wadsworth Longfellow's poem "The Masque of Pandora" (1875).
This episode was originally released in two parts on U.K. TV. The episodes were combined into one episode for U.S. video release.
John Light also acted in the pilot episode of Endeavour.
Andrea Lowe and Kevin Whately also acted together in the TV series Peak Practice.