Colin Dexter (author of the Morse novels) cameos as one of the guests at Matthews' party. He can be seen talking to Superintendent Innocent.
Gavin Matthews: He that is not jealous, is not in love.
Innocent: My God. Have you got any idea how this looks? Chippy copper antics have no place in a city like this.
Innocent: And in case it slipped your mind you've got the next best thing to a signed confession tucked away in that hospital tonight. God only knows what possessed you to enter into some misbegotten pissing match with men of that standing.
Lewis: What's so special about Oxford?
Lewis: The chippy copper antics. Why is it so much more inappropriate in this city than anywhere else?
(Lewis and Hathaway are waiting in the hospital for Lewis' back injury to be looked at)
Lewis: If they ask...
Hathaway: Yeah, yeah, do not resuscitate.
Lewis: I was gonna say, "two sugars".
Lewis: I noticed, Hathaway, you always call me 'sir' when you say something mean.
Hathaway: Public school.
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Hathaway: "We perished, each alone."
Lewis: "But I beneath a rougher sea, and whelmed in deeper gulfs than he." One of Morse's specials.
The sergeant and inspector are quoting the final lines of William Cowper's 'The Castaway'.