One of the reasons this episode works so well for me is the insistence of Osgood that she is Osgood, and that's all you need to know. She can hold her own against the Doctor on ethics and secrets, and you will not know which Osgood she is - or her first name for that matter. Where this breaks down for me is that she…

New who had far less of this than classic who, but this was, for me, really over the top.

No comment on the rubber-suitedness of the final scene? That was incredibly immersion breaking to me.

Ha! Ha, Ha!

The 'sudden realisation he is hugging her' was actually one of the few things I disliked about the episode. It felt forced to me

"every lonely monster needs a companion". That in conjunction with the reminder that you can't trust the doctor according to Emma ("there is a sliver of ice in his heart" - good thing he has two), his conversations with Alec, "I killed, and caused to have had killed, […] and it tends to haunt you - living - after so…