Doctor Who: 14 Cool Details Revealed In Steven Moffat's Wedding Of River Song Commentary
13. The Doctor's Knitting Magazine Was Meant To Appear In The Beast Below
While on Calisto B, the Doctor reads a magazine called Knitting For Girls... because reasons.
It's a weird gag that somehow still fits the Doctor's character (and in fact, Eleven does mention a knitting lesson in The Impossible Astronaut), and according to Moffat, he's been wanting to do something like this for a very long time.
Apparently, he originally wrote this magazine into The Beast Below - which aired well over a year before The Wedding Of River Song did - but the idea was ultimately scrapped.