i find what Tywin said very interesting. That the lannisters mines have dried up. Wonder wether that is just series or something similar will turn up in the books later on.
Also, is it me or did Arya's list of names change quite a bit from the books. Like previous comment, i wonder wether that just for the series cause lots of characters from the books not in the series, and how much will actually also come about in the books in the future. Cersei, Red Woman, Beric Dondarrion, ... . My guess is unlike in the books she wont complete her hit list since she didn't kill beric there.