The Wormhole wrote:
The main problem is that since Moffat took over he's been drilling it into our heads that Smith is the Eleventh Doctor. The premiere episode is titled "The Eleventh Hour." The Doctor refers to himself as "the Eleventh" in The Lodger, which also features him wearing a jersey with 11 on it during the football game. And then there's the whole "Fall of the Eleventh at Trenzalore," which is kind of an integral part of the overall arc of the Smith era. So Moffat has gone out of his way to make sure we think of Smith as the Eleventh Doctor just to reveal that he's actually the Twelfth.
^ It is incredibly strange, isn't it?
But on the other hand, Moffat has kind of covered that too: Hurt is a repressed memory. The Smith version of the Doctor has actually convinced himself
that he's the eleventh incarnation, and it isn't until the climactic events of Series 7 that he is suddenly reminded, brutally, that there's an entire incarnation that he's been kind of pretending never happened. But it did. 'Day of the Doctor' is really all about the Doctor finally accepting that.