Doctor Who: 17 Cool Details Steven Moffat Just Revealed About The Eleventh Hour
11. "I'm Not Done Yet" Was A Last-Minute Addition
Shortly after slagging off Leadworth, the Doctor falls down next to a duck pond, with the identity-shifting effects of regeneration clearly still having an impact on his body.
This quick moment - as revealed by Moffat - was added quite late in the game, with the intention of the scene being to reinforce the fact that Smith was a brand-new Doctor.