What a pile of shite.
You'd think that just this once Moffat would want to go for substance over style but instead with get his usual pile of crap that makes no sense once you apply two seconds of thought to it.
So you can't go back to New York in 1938? Go to London and send them some plane tickets.
So the Doctor can just dish out regeneration energy to heal people whenever he likes? Aren't there a couple of thousand times in the past fifty years of stories when that might have come in handy?
And I'm not even going to touch the stealth capabilities of the Statue Of Liberty.