The castle must have phone booth parking
Confirming his famous Doctor hairdo (sported by the banana above) will be making an appearance in spite of his current shorter look, Matt Smith says:
The coif will be there for the finale in some way, shape, or form, but I think it could be quite funny to have the bald hair. I think you could have, like, that MACaulay Culkin scene in Home Alone when he, like, slaps on the aftershave - I think the Doctor could sort of wake up and be like, 'Ah!' I'm sure Steven will come up with something. He'll come up with something clever.
Source: Contact Music