Speaking of Jaqen, I don't remember him mentioning that he was a Faceless Man when he gave Arya the coin in the books.
I believe you are correct, but I think the Faceless Men had been mentioned offhand somewhere in the books before that, so readers would be able to put two and two together when he started shapeshifting. I expect that the show writers had Jaqen spell it out for everyone so that the people who only watched the TV version wouldn't be left in the dark.
--
SuperNiceDog is about 20% cooler then the other gurus.