Diana Weston (WPC Janet Reynolds) previously appeared in Sweeney 2 (1978) as Air Hostess. She later became best known for playing Caroline Wheatley in The Upper Hand (1990) from 1990-1996.
The location used for Alan Ember's house is the same one where Philip and Marcia Edmunds lived in 'Lady Luck' (1976).
The following actors from this episode later appeared with John Thaw in Inspector Morse (1987). Cheryl Campbell (Erica Taylor) appeared in The Infernal Serpent (1990). Geoffrey Palmer (Commander Watson) also appeared in 'The Infernal Serpent'. Robert Oates (D.I. Jim Hinxman) appeared in Ghost in the Machine (1989). And John Junkin (Taxi Yard Proprietor) appeared in Cherubim & Seraphim (1992)
The following actors from this episode later appeared with Dennis Waterman in Minder (1979). Brian Capron (Colin) appeared in Around the Corner (1984). And Marc Zuber (Abdul) appeared in Aces High and Sometimes Very Low (1979)
Brian Capron (Colin) later became best known for playing Richard Hilman in Coronation Street (1960) from 2001-2003.