Okay, missed this last night, so playing catch-up. Here goes...
Interesting stuff. Older doctor (much older doctor) - or is he? We only have his word for it and, as has been mentioned before - rule number one, according to River - the Doctor lies. Then again, why would he lie about his age? Hmm. Going to have to think on that one.
"Lots more happened in 1969 that anyone remembers." Hmm again. Not a throwaway line, methinks.
Ooh, and now dead Doctor. Or is he? Apparently so, but then we know he can't be, so there'll be an out somewhere. Not the first time he's died, after all - though how he gets away from that pseudo-Viking burial... And the astronaut, whom he knows and was expecting and whom, presumably, he was expecting to kill him. Thrice hmm.
Ah. Here's our Doctor! Very much alive. And more out of the loop than the others, for once. Ha-ha!
Stuart Milligan. Bad choice as Nixon. Bad voice. Bad actor. Bad bad bad. Like Canton, though.
River knows the Tardis better than the Doctor again. Silent running and invisibility - odd that the Tardis would need invisibility, given its perception filter, but maybe in such a small, enclosed space like the Oval Office? Harder to miss, perhaps. Ah, no. It's just for the reveal. Hokey dokey.
Nasty alien in one of the White House bathrooms. Amy has to tell the Doctor "what he must know and what he must never know". Assuming the latter is about his death, but then maybe that's too obvious. Oh, and she's forgotten anyway. Heigh-ho.
And away to save the little girl, assuming that's what she is. And more aliens, and lots of tunnels under a warehouse...and the sort-of Tardis from The Lodger. And the tunnels aren't just under the warehouse. And something's happened to Rory. Bad something. Yay!
Amy's pregnant! Again! For real, this time? And why so important to tell him now? Oh, no time for that, here comes the spaceman...and it's the little girl! And Amy's shot her! Has she? No, can't have. Oh, and roll credits.
Well. Quite the opener. Lots to get the old teeth into, lots of things that can't be and things that might be and things we kind-of knew from before. And at least one thing that Amy still has to tell the Doctor, maybe. Good stuff! Like it!
And relax.