Amongst other things Watson (Martin Freeman) is rocking a glorious moustache. So obviously the big question is...
WHY DOES WATSON HAVE A MOUSTACHE?
1) Time- If the show is following the books, it is three years since Sherlock was presumed dead. Therefore, the moustache might be to signal that time has passed, and make him appear older.
2) Grief- If it is only a couple of months since Sherlock as died (which I think is more likely), Watson might have grown the moustache in order to feel like a 'new man' and attempt to move on from his life with Sherlock (I realise that makes them sound like lovers).
3) Homage to the Books- As shown by Jude Law's Watson, in the books Watson does have a moustache.
'Sherlock' has referenced the books before with Holmes' famous deerstalker hat, so this is a possibility.
4) Movember- One of my friends cleverly pointed out the moustache could be for Movember. Watson seems like the kind of guy to give to charity, doesn't he? And it is predicted that the first episode will be broadcast on October 31.
Anyway, there are a few of my theories. And, as important as Bilbo's moustache is, there is an even more important matter at hand to discuss...
HOW DID SHERLOCK SURVIVE?
There are a lot of elaborate fan theories on the internet, but I am just going to point out a few things I think are relevant in how Sherlock managed to fake his own death. I've tried to find a video online showing the detective's 'death', but could only find dramatic fan edits with a super indie soundtrack. Picture Sherlock falling gracefully in slow motion through the air, intercut by Watson wailing and dramatically running, all to a haunting Lana Del Rey song. Great stuff. Anyway, Sherlock had to throw himself off the building in order to stop everyone he cares about (eg. three people, which made me laugh, and also a little sad for him) getting assassinated. Watson saw Sherlock fall, got hit by a bike, ran towards his body, and felt his pulse before Sherlock got whisked away on a stretcher. Whilst we didn't see Sherlock's face, there was blood spreading out on the pavement from the back of his head. Here are a few factors I think are worth considering:
1) Truck- There is a clear white rectangular outline drawn on the pavement below Sherlock, which a garbage truck then parks in. I am almost 99.9% certain Sherlock somehow fell on purpose into the garbage truck, and then either rolled out and pretended to be dead (see below), or somehow managed to arrange Moriaty's body on the ground and made it look like him. They were both wearing very similar outfits and both had head wounds, which would have made it easier.
2) Bike / Watson's Emotional State- Watson never sees Sherlock hit the ground. He sees him falling just before the level of the garbage truck. Then, a 'youth' on a bike comes and knocks him over. After that, Watson is incredibly disorientated, as emphasised by the spinning camera movements. He is also in shock. I think his emotional state means that he couldn't have possibly felt Sherlock's pulse properly, and therefore got an inaccurate reading. Also, how about this...the guy on the bike was hired by Sherlock, and sprayed him in the face with the HALLUCINOGENIC GAS from the previous episode ('The Hounds of Baskerville'). This gas makes you see the worst thing possible, that which you are most afraid of (sounds like something off 'Harry Potter'). Wouldn't the dead, broken body of Sherlock be what Watson was most afraid of in that moment? Sherlock could have engineered this to elicit a genuine emotional response from Watson and therefore trick the assassins, and also to give himself time to escape (I also think the 'paramedics' arrived suspiciously quickly...could Sherlock have arranged them?)
3) Molly- Sherlock asked Molly to do something for him. Did he ask her to make the hallucinogenic mask? Did he ask her to give him a drug that would slow down his pulse and make him appear dead? Did he ask her to make him a mask of his own face to put on Moriaty's body? Also, given Moriaty tricked Molly into being his fake girlfriend, she has reason to help Sherlock foil him / bring him down.
4) Fall- Sherlock was kind of methodically waving his arms around when he was falling, and with his feet pointing downward he seemed to be aiming for something. Was he trying to slow his fall down in some way? Had he practised? Was Sherlock going to fake his own death anyway to make Moriaty think he had won? Or had he planned an escape route? Basically, was he always going to jump off the roof? QUESTIONS.
I think Sherlock must have had some kind of inkling of what would happen with Moriaty, because even though he is a super genius, I don't think he could have figured out how to fake his own death and survive a roof plunge in five traumatic seconds. I guess we will find out soon, stay tuned for recaps of 'Sherlock' Season 3.