Trying to avoid spoilers here...
In the second episode, it's interesting to see how Sherlock's thought bubbles varied when he was drunk from when he was sober. He was supposed to make observations at the crime scene and there was a shot of the scene with all his drunk observations superimposed over the various pieces of furniture, etc. One that I noticed was "Silly Thing" and then I noticed that the word "Thing" was on almost all of the items. And just before, when Sherlock and Watson were called to work by a client, Sherlock slurred, "The game is . . .something" and Watson replied, after reflection, "er. . . on?" It was pretty funny. I never did quite get why they were getting drunk...did Sherlock think they had to do a bachelor party??