When DI Box and DS Dawson are first introduced at the police station, the clock remains stopped at 10:41 over several minutes. But we know it's running, because earlier that morning it showed 9:35.
At one point Morse walks on a railway line that "has not been used for years". If that were the case the track head would be rusty and not shiny as seen.
When Morse arrives at Joan's party they are playing 'Can't You Hear Me Knocking' by the Rolling Stones from their album 'Sticky Fingers' which was released in 1971, three years after this is set.
In giving a car registration number over the phone, Morse uses the international phonetic alphabet correctly with one exception. He says "Mother" for the letter M, instead of Mike, which has been the standard from 1956, since when there have been no changes,. Police officers would be well trained in this for all radio and phone communications.
In the final scene when Morse and Thursday get in the car to drive away from the cottage there is a colour television aerial shown attached to the chimney stack and whilst colour programs were being shown in 1968 they would not have required a digital aerial to receive them.
Mrs. Thursday, watching television, asks "What time are the Minstrels on?", but there was no edition of "The Black And White Minstrel Show" shown on BBC Television during the first week of June, 1968, when the story takes place.
Incorrectly attributed as a factual error, the shiny tracks Morse walks down do not belong to the disused train. The tracks with the out of use cars are overgrown and Morse never actually walks them. He walks the tracks, adjacent to the out of use ones, on which his train was traveling.
The Union Flag on the roof of the Gidbury's building is upside down.
In the house warming party the Rolling Stones track, Can You Hear Me Knocking, is playing as Morse goes through the house. The events of this episode take place in 1968 but this song was on the Sticky Fingers album, which came out in 1971.
As Fancy is waiting by the river, and Trewlove comes along to meet him, a rowing four goes past. The boat has a modern white composite hull, made by the Janousek company, founded in 1981, The oars are also a modern composite type. In the 1960s all boats and oars were wooden.