Stella Gonet (Frances Woodville) is inadvertently omitted from the closing credits.
In this episode, Hathaway contacts The Royal Canadian Mounted Police (RCMP) about Simon Monkford's time in Toronto. The RCMP do not have jurisdiction in Toronto: it should have been the Toronto Police Service.
Colin Dexter (author of the Morse novels) cameos as one of the guests at Matthews' party. He can be seen talking to Superintendent Innocent.
Hathaway comments on the crucifixes in Will's flat, but we're shown ordinary crosses, not crucifixes, which are crosses with the crucified Christ. Since Hathaway studied to become a priest, he should know the difference.
Billy Geraghty, who played Walker, is credited as Jackson. William Hope, who played Jackson, is not credited at all.
Goof: The Bodleian librarian refers to the library as having had its first murder for 500 years, but in actual fact the library, established in 1602, is only just over 400 years old.
At one point, Lewis annouces that he's attended "far too many Masonic dinners". Inspector Morse was a Free Mason himself.
At one point in the episode, Anna Massey's character of Professor Gold asks Lewis if they have ever met before. Anna Massey played the character of Lady Emily Balcombe in the Inspector Morse episode, Happy Families.
Colin Dexter (author of the Morse novels) cameos as an Oxford don, seen in the opening dining scene where Sefton Lynn says grace. Dexter also worked as a consultant in the episode, helping the producers form the said grace in Latin.
Colin Dexter (author of the Morse novels) cameos as a college porter, wearing a bowler hat.
The pub at the end of the episode is The Trout, just outside of Wolverton (a part of Oxford). It is also in Wolverton that J. R. R. Tolkien is buried.