... that if there are two Doctors, the second one could be the ganger Doctor. That might explain different tastes and the Rubik's Cube. If it was the ganger Doctor who dies in The Impossible Astronaut, perhaps that explains the wine thing and the conversation about Easter Island with River. Though, the ganger Doctor supposedly had all of the Doctor's memories, which would have included the taste of wine. And it doesn't necessarily explain the fact that the Doctor who died started to regenerate, nor the fact that Moffat says it was the real Doctor. But if it is the ganger Doctor, I still say they're working together.