Oh My God, Moffat!!!!
Okay, there were many things about yesterday’s episode that were incredible but I have to start with this tiny reference to River Song:
River knows the Doctor’s name, which we know is the actual, proper TARDIS key. The Doctor abandoned her in the Library “like a book on a shelf”. So Clara taking a key out of a book on the shelf – that’s a reference to River.
Which book is it, you ask? It’s The Time Traveller’s Wife.