My sister and I compare the movie version (Downey/Law) characters with the TV version (Cumberbach/Freeman) and how the movie couple dynamic is extremely 'bromance' and Law's Watson is not averse to punching Downey's Holmes in the face when he gets fed up with his obnoxiousness, while in the TV version, Cumberbach's Sherlock is passive aggressive and when Freeman's John is winding up to be angry, Sherlock either modifies his behavior or he says something that takes the wind out of John's anger
"There's a head in the refrigerator."
"Just tea for me."
"A bloody head!"
Where else was I supposed to put it? You don't mind, do you?"
"Why didn't I think of that?"
"Because you're an idiot. No no no. Don't be like that, most everyone is."
Hmm. I do believe there is a line somewhere in the "canon" where Holmes says to Watson, "I'd be lost without my Boswell," or something very close to that.
It is. It's one of the many little tidbits the producers - who are extremely familiar with the Sherlock stories - put in the shows, either quoting directly or 'updating' it. People familar with the stories have been picking them out.