I have been remiss in my duties, mostly because I was attacked by the evil Dragoncon plague.
A few pieces of trivia, by way of The New Annotated Sherlock Holmes about "The Speckled Band" and "The Blue Carbuncle."
"The Speckled Band"
Holmes says "'When a doctor does go wrong, he is the first of criminals.... Palmer and Pritchard were among the heads of their profession." William Palmer (1824-1856) was a surgeon who was hanged for poisoning his wife, brother and business associate for their insurance money and who was rumored to have poisoned perhaps 15 people. Edward William Pritchard (1825-1865) was a surgeon who was hanged for poisoning his wife and mother-in-law.
There is no such snake as as a "swamp adder." There is no snake venom that kills in 10 seconds. Snakes can't hear, so what was the whistle for?
"The Blue Carbuncle"
The word "carbuncle" normally refers to a garnet, but Holmes refers to it as "crystallized charcoal," which could only refer to a diamond. Also, there are no blue garnets.
The "billycock" hat that Holmes studies so closely is a bowler or derby.
Geese do not, strictly speaking, have crops.
Holmes says, "'When you see a man with whiskers of that cut and the 'Pink 'un' protruding out of his pocket, you can always draw him by a bet.'" The Pink 'un was a popular name for the Sporting Times, which was printed on pink paper like The Financial Times.
One Holmes scholar computes that in the 60 chronicled cases, there are 37 definite felonies in which Holmes determined who the guilty party, and, in 14 cases, Holmes freed the guilty person.