I don't consider this a spoiler because people are only going to understand what I'm saying if they've read the books:
There was a big uproar on twitter that they seemingly replaced the Kindly Man with Jaqen Ha'gar. My question is this: Did book readers just get spoiled by the show without realizing it? Do we have any evidence from the books that Ha'gar and the Kindly Man are actually different people? The people from the House of Black and White are faceshifters, so how do we know that the Kindly man isn't just Ha'gar and that GRRM simply hasn't revealed it yet in the books? Not only does it seem plausible to me. It actually makes a ton of sense. I know there is that one scene in the opening of FFC that people seem to think is Ha'gar, but I see no reason that it has to be, or that even if it is, that Ha'gar couldn't get back to the House of B&W in time for Arya anyway.