Steven Moffat on John Hurt's Doctor said:Why not a mayfly Doctor, who exists for one show only? I’d often thought about that. Would it be weird in the run of the series to have the 45th Doctor turn up and be played by Johnny Depp or someone? Would that be a cool thing to do? There was also the idea that if you could bring one classic Doctor back, you’d actually, impossibly, want it to be William Hartnell. You wouldn’t want any of the others. You’d want him to come and say ‘What in the name of God have I turned into?’ That’s the confrontation that you most want to see, to celebrate 50 years. Going round and round in circles on it I just thought ‘What about a Doctor that he never talks about?’ And what if it is a Doctor who’s done something terrible, who’s much deadlier and more serious, who represents that thing that is the undertow in both David and Matt. You know there’s a terrible old man inside them. Well, here he is, facing the children he becomes, as it were.
Also, on regenerations, he says, "I think you should go back to your DVDs and count correctly this time; there's something you've missed". The commenters think that he's referring toin "Let's Kill Hitler".River giving him her remaining regenerations
To be fair to Moffat, a lot of people have been saying "omg the doctor only has one regeneration left the show is almost over" incessantly so it apparently isn't obvious to people who don't follow the show obsessively like we do.
Of course, it could also be a reference to the questions about a scene in Brain of Morbius.Also, on regenerations, he says, "I think you should go back to your DVDs and count correctly this time; there's something you've missed". The commenters think that he's referring toin "Let's Kill Hitler".River giving him her remaining regenerations
This episode contains a sequence in which the three previous incarnations of the Doctor are shown, and eight additional faces beyond that. The scene is so trippy, though, that those could just as easily have been Morbius' old faces or just some random moustachio'd gentlemen. Morbius asks "How far back Doctor, how long have you lived?" — even by Time Lord standards, it seems The Doctor has been around for a while.
Steven Moffat said:They’re not broody, upset Doctors – it’s more 'There’s two of us! Brilliant!' They’re naturally funny together.
They get giggly with each other.
yap, Tennant is fantastic. sadly i'm watching the seirei in italian and a lot i s lost (i only dare to imagine Tennant voincin Cassandra XD)