Regarding (SPOILER)the Silence and their apparent lack of presence in the series 7 finale, this is from TV Tropes' Wild Mass Guessing page:

(SPOILER)The Silence were present in the episode, we just didn't see them. Specifically, they are spying on Jenny and Vastra. Jenny looks like she sees something that she couldn't quite focus on, just like when Amy saw the Silence for the first time, and is then interrupted by Vastra stepping in front of her, just like Rory did. It could have been the Whispermen she saw, but there is a remarkable similarity to The Day of the Moon.
It would make perfect sense for them to be spying on (SPOILER)Jenny and Vastra, since they live in a time before the moon landings. Of course, if they've seen the moon landing tape in their time travels, this would throw a big wrench into the Silence's meddling.