I liked this episode. Felt bad for old Amy, but I kinda expected the doctor to do something like that (actually, I thought he was lying about the TARDIS being able to sustain a paradox, and that the old amy will cease to exist when they get inside)

I got the hint that Rory's starting to turn sour on the doctor. And I dunno, maybe Amy's going to go the same way eventually. He's done things to them - with Rory losing this amy, and amy losing Rory to the cracks in the previous season. I'm at the point where I wouldn't be surprised to know that the astronaut in lake Silencio has something to do with Amy and Rory falling out with the doctor, which would explain why he didn't resist.

I would have made the doctor say "this is kindness" as he leaves old Amy, though.