This isn't going to be one of my long essays yet. I have to wait for until I find all the pieces of my exploded brain for that.
Clearly someone told Moffet he couldn't possibly top what he had already done.
Clearly he took that as a challenge.
THANK YOU!
But for the benefit of those fans worrying over the ending...
..there's no way that could be a little child in that spacesuit. Those things were made for a 6 foot man and weighted over 400 POUNDS. A kid couldn't even stand in one of those things, let alone walk; and they certainly wouldn't appear that tall.
(Dd1 would like to point out that every time River Song shows up, it's a two-parter.)