This story again features the LP of opera singer Rosalind Calloway, which Morse was looking at in "Cartouche", the previous episode. Now, P.C. Trewlove finds it for sale in an open-air market and realizes that it is Morse's own because the singer has autographed it for him and included his name in the inscription. (Rosalind Calloway, aka Mrs. Stromming, was featured in the "Endeavour" pilot film).
Mrs. Thursday mentions going for lunch with her daughter at "Burridge's" - the big department store which is at the center of the earlier episode "Sway". In addition, this story is one of several "Endeavour" episodes to refer to "Radford's", the local brewery originally depicted in an "Inspector Morse" episode, whilst the stolen goods are said to have been intended for "Richardson's", the supermarket chain featured in the earlier story "Arcadia".
The station which features in this episode is Norborough. This is the name of the station in the April 1967 Avengers episode A Funny Thing Happened on the Way to the Station (1967).
Morse goes to a hotel in Kings Oak just outside Birmingham called The Crossroads Motel. This was the setting of Crossroads (1964), a soap series where one of the main characters was a cleaner named Amy Turtle. The receptionist who shows Morse the room, that hadn't been cleaned, said she would have to have a word with "Mrs T".