First appearance of Colin Jeavons as Inspector Lestrade.
The end credits for this episode appear initially over a scene as John Hector McFarlane returns to his family home.
Sherlock: Gentlemen: would you please join me in the call of "fire"? One, two, three: fire!
Constables: (Halfheartedly) Fire.
Sherlock: We can do better than that. Full voice. And together.
Lestrade: Mr. Holmes! I don't know whether you are playing a game with us, but surely you can tell us without all this tomfoolery.
Holmes: I can assure you, Lestrade, I have an excellent reason for everything that I do.
Sherlock: You mentioned your name just now as if I should recognize it, but I can assure you, beyond the obvious facts that you are a bachelor, a solicitor, and a freemason, and an asthmatic, I know nothing about you whatever.
(John McFarlane looks at Watson, confused and dazed.)
Watson: Your (ahem) untidy clothes, sheaf of legal papers, watch-chain, and your somewhat irregular breathing.
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This episode is based on Sir Arthur Conan Doyle's story The Adventure of the Norwood Builder, which first appeared in Collier's magazine in October, 1903.
The dramatization brings a seafaring tramp into the story to fulfil the role which Doyle left to "a dead dog or a couple of rabbits".