When Haskins goes to see his son Richard at school, the name and postcode of a real school (Bradfield College, near Reading) are seen briefly in a letter to Richard from Mrs Haskins. However the scenes were actually filmed at a different location, the Bank of England Sports Centre in Roehampton, London.
Lynda Marchal later became Lynda la Plante who would go on to script Widows and most famously, Prime Suspect, starring Helen Mirren.
Last appearance of DS Tom Daniels, played by John Alkin. He appeared in 12 episodes and both films. His first appearance was in Poppy (1975)
Doreen Haskins previously appeared in Golden Fleece (1975), where she was played by Anne Stallybrass. In this episode she is played by Sheila Reid