Doctor Who: 14 Cool Details In Steven Moffat & David Tennant's Silence In The Library Commentary

14. Apparently, This Is The First Episode Where Tennant Fastens All Four Jacket Buttons

Not the most mind-blowing or informative of details to point out, but hey, the commentary starts with Gardner, Moffat and Tennant rambling on about pretty much nothing, so it's slim pickings to start with!

When the Doctor and Donna appear onscreen just before the title sequence, Tennant mentions that this episode "is the first time that I've ever done all four buttons up on my jacket". Why? Apparently, the blue suit "looks better more done up".

Tennant goes on to explain that he likes to meddle with different button combinations, so keep your eyes peeled during his run and you'll probably notice that he constantly varies which buttons are fastened, and which aren't.

And also, this gives you something to look out for during the boring episodes. Looking at you, The Doctor's Daughter.