"Oh, this is so you... A weird new star, fourteen minutes left to live and only one man to save the day?" Rory has joined the DL in critiquing everything about the Doctor. "I just wanted a nice village and a family," he says, which is a clever bit of writing that throws you off track by adding to the pile of herring, going back a few episodes at least, that says Amy's Choice is between Rory and the Doctor. It's a grody parallel, but it's not the point, and the episode knows that you think that already, so it's a great way to catch you up. The DL appears to sing a little song at this point: "There was an old Doctor from Gallifrey/ Who ended up throwing his life away/ He let down his friends and..." The birds again, and the DL leaves off. "Don't spend too long there, or you'll catch your death here!" he laughs, as they drop away.
The children, last seen playing in the gorgeous old ruins, are now piles of ash. I don't love the whole "old people = creepiness" zombie thing about this story, although once you know who's telling it you know why it's so. But I do love the imagery, of these ancient castles and walls and the children herded between them, lying dead. The Village That Time Forgot, and all that. It's just beautiful to look at, and makes the greater point in a very elegant way. There is a difference between growing up and growing old, and Amy doesn't know the difference, and the Doctor can't really be expected to understand the difference, so he keeps warning her about the former when he's really scared about the latter, and it all just confuses her more. She's been growing older no matter how hard she fights growing up.
Rory "just feels" that this is the right world, as we revisit these ideas again with what we've learned or think we learned, and Amy shrugs: "I feel it both places." Rory loves that it's tranquil, and relaxed, and how nothing bad could ever happen there. Amy doesn't see how any of those things could ever apply to her: "...A pub, two shops and a really bad amateur dramatics society? That's why I got pregnant, so I don't have to see them doing Oklahoma!"