Trigger Note: Domestic violence will be mentioned in this chapter. I'm sorry if I upset anyone. It's the last fact, so you can skip. Once again, I'm sorry if I upset anyone. 

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~ When a new episode airs, the whole cast goes over to Amanda and Martin's house to watch it.

~ Jim Moriarty's brother in the books was named Jim Moriarty. No joke. Nice, Doyle. Nice.

~ Harriet Watson was a boy in the books.

~ There are about 50 stage productions of Sherlock Holmes. 

~ In the beginning of the series, John is not able to afford to live on his own. However, his jacket costs over a thousand pounds and his shoes are over one hundred pounds. But, it is possible that he had these before he came home from war.

~ Andrew Scott didn't read any of Doyle's stories. He wanted his Moriarty to be original. 

~ Additionally, the pool scene at the end of The Great Game was Andrew's screen test for Moriarty.

~ Season one was filmed in reverse order. The order is: A Study in Pink, The Blind Banker, and The Great Game, but it was filmed the opposite way to accommodate Moffat because he was busy with Doctor Who. 

~ Benedict grew up knowing Una Stubbs, who plays Mrs. Hudson on the show. The scene where he gives her a kiss on the cheek in A Study in Pink was improvised. He says that she is like a second mother to him. 

~ It's possible that Mrs. Hudson had an abusive husband on the show. She jumps whenever Sherlock or John shouts, slams their hands down on something, or kicks something. She also jumped when Mycroft told her to shut up in A Scandal in Belgravia. These are usually symptoms of someone who's suffered domestic violence.