In Season 2, Episode 7 ("A Man Without Honor") of HBO's Game of Thrones, there is a dialogue between Tywin and Arya.
Tywin Lannister: Girl, m'Lord. Low-born girls say m'Lord, not my Lord. If you're going to pose as a commoner, you should do it properly.
Arya Stark: My mother served Lady Dustin for many years, my Lord. She taught me how to speak proper... properly.
Tywin Lannister: You're too smart for your own good. Has anyone told you that?
Arya Stark: Yes.
I'm not sure I understand this. Thus far Arya is concealing her true identity, claiming to be a daughter of a self-taught and educated stone mason, a commoner.
What does Tywin mean by what he says? Does he believe she's not a commoner, and is really of some noble birth by trying to correct her?
I only seek an explanation up to this point in the tv-series. Nothing beyond in the novels.
I get the feeling Tywin would have completely figured out just who Arya was if he had the time. Who knows how the story could have changed if he hadn't been forced to King's Landing to dispatch Stannis!
– Starkers May 20 '13 at 07:29