At the book launch near the beginning of the episode, Doyle is approached by a man wearing an Inverness Cape and a deerstalker hat. He holds a curved calabash pipe. The man gleefully says to Doyle, "The game is afoot." This episode is set in 1901. The story that is the source for the quotation is "The Adventure of the Abbey Grange" which was published in 1904. The quote would have had no association with Holmes in 1901. The cape, the hat, and the pipe, however, could possibly have been known to a Holmes aficionado. Although not referred to in the stories themselves, Sidney Paget, the original illustrator of the stories, introduced the cape and hat in "The Boscombe Valley Mystery" (1891), and the calabash pipe was first used as a Holmes accoutrement by the actor William Gillette in his 1899 play "Sherlock Holmes." It's balance afforded him a clear delivery of his lines whilst he held it in his mouth. It has, since, been used by almost every actor who has essayed the role of Holmes, whether on stage or screen. Although pipes are mentioned in the stories, and depicted in the Paget drawings, they are never the, now, trademark, curved, calabash pipe of Sherlock Holmes.