More ideas from Tarja
There are lots of Arthur Conan Doyle Easter Eggs sprinkled throughout Sherlock.

He made soooo many references, and should, and I think the most obvious is "a study in pink" vs. "A study in scarlet". Also one of the original quotes is "it is quite a three pipe problem.

You know you're a Sherlockian when...

You know you're a Sherlock fan when. (I have to try the Vatican Cameos thing with the safe at work. Although I strongly suspect it will not end well.) < I gotta admit when something feels wrong I always want to shout VATICAN CAMEOS