In the last scene, Lewis and Hathaway discuss the concert and Lewis says he prefers Wagner especially if the conductor is Ker-napperts-bush. This refers to a scene in The Remorseful Day in which Morse is impressed by Lewis playing a tape of Parsifal conducted by Fritz Knappertsbusch. Lewis pronounces the name as Nappers-bush; Morse corrects him by saying "we pronounce it Ker-nappers-but-sch".