"Granada's pretty good too. They erased Mary, which it looks like the BBC might be doing as well, and tried to play straight the whole thing where Moriarty was there from the beginning. But it work. Not really. They mentioned him in the Red-Headed League, and maybe one other one, and then all of a sudden, the Final Problem.

"At least with Moffat, Moriarty was right there in a Study in Scarlet. Or, what they called a Study in Pink, although we don't get to see him until the Great Game. And then he's in it through Reichenbach."

It's not often Sherlock's allowed to properly geek out like this. He seems to be enjoying it.