Didn't really buy into Jon's reaction to being told about his real identity. I know he trusts Sam, but you'd think if you've just been told your entire upbringing and parentage was a lie, you'd have a bit more trouble accepting it than that.
I didn't mind the dragon riding scene as a cooldown from the breakneck pace they've been going at in the latter seasons, but devoting more time to it than the Jon/Sam scene seems like a very weird choice.
It'll be interesting to see how the Northerners respond. They may have begrudgingly accepted Jon giving away their autonomy when they thought he was Ned Stark's son, but might not be quite so understanding when they find out he's actually a Targaryen.