Man, why is no one else complaining about that rushed-as-hell bit at the end with the kids magically figuring out the Clara is a time traveler? I mean, do you have any idea how much information they would have to sort through to find those pictures? And just because he happened to see ONE old picture with a woman who looks like Clara? Come on, now.
I actually like the idea, but the execution was just out-of-nowhere. I wished they'd foreshadowed it a bit. Something like the thing they did in season 3 where Martha kept calling her family. I don't know, there should have been SOMETHING other then a chance encounter with an old photo to make the kids suspicious.
Still though, this was a really good episode. The Victorian 3 (as I guess we're calling them) were great, nothing was solved with the power of love (quite the opposite, really) and no real glaring plot holes as far as I can see. Yeah, I liked it. Not my favorite of the season, but still very good.