In His Last Vow, Mycroft is questioned about his feelings for Sherlock and he says "Don't be absurd. I'm not given to outbursts of brotherly compassion. You know what happened to the other one." ...
In Sherlock season 1 episode 1 the serial killer asks Sherlock to take one of two bottles. 1 bottle is ok other is bad (poisonous). Whatever bottle Sherlock takes the serial killer takes the other ...
In the TV Series Sherlock I know there are many references to the original canon (for example the hat). Particularly variations of the episode names. A Study in Pink - A Study in Scarlet A Scandal ...
At the end of "The Reichenbach Fall", Sherlock and Moriarty have a confrontation on the roof of the hospital. (I am not sure why Sherlock chose the roof in the first place, but that is neither here ...