In 1945, the widow Olive Durand-Deacon describes her husband as having served in "The Glorious Glosters". Although a common nickname for the Gloucestershire Regiment, it derives from their heroism at the battle of the Imjin River during the Korean War - in 1951.
Haigh meets the Hendersons at the seaside and comments "splendid weather for February!" (it was in fact 12 February 1948 when he killed them). He is then seen driving Archibald Henderson to his workshop down a road with trees in full leaf; this must have been filmed in May or early June.