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.