Catherine Dawson states that her husband believes Morse to be a "Very Good detective. Poor policeman and a very good detective." This statement is a common theme in the series Endeavour, the prequel to the Inspector Morse series.
The operatic aria heard at points throughout this episode is "Senza Mamma", sung by Janis Kelly, from 'Suor Angelica' by Giacomo Puccini
Colin Dexter is sitting with a crossword, behind Morse, when Barbara Redpath comes to the meeting at the pub by the weir.
Oliver Ford Davies, who plays Frederick Redpath in this 1991 episode would work with John Thaw from 1995 to 2001 in the legal series "Kavanagh QC" where Thaw played the title role and Davies, his colleague in Chambers, Peter Foxcott QC.