Episode #3 had a running commentary with show creator Jon Robin Baitz, Craig Wright, Patricia Wettig, and Matthew Rhys.
Of course, I knew Matthew Rhys was British (Welsh actually), but I had no idea that in donning an American accent for the role, his voice also lowers in register. To hear him talking in his own voice during the commentary was very strange. It was a very lively and interesting discussion among the four of them.