Doctor Who: 20 Things You Didn't Know About The Day Of The Doctor
1. Matt Smith Kept Offering The TARDIS Controls To David Tennant
Matt Smith is arguably the most adorable human being ever to walk the Earth. If you need any proof of that, look no further than this anecdote from The Day of the Doctor's filming.
Possibly feeling a little awkward that his co-star was stood around with nothing to do, Smith would frequently offer the TARDIS controls to David Tennant while the two were shooting those interior scenes.
According to Moffat, Smith would say, "I mean, it's your TARDIS too!" only for Tennant to retort "Oh, no, no, you're doing fine!"
And hey, Smith was a very experienced TARDIS pilot by that stage, even if Tennant was being a little sarcastic. Just a friendly bit of banter between Time Lords!