Indeed, the accents do change as you move around the region. My wife's father is from the Asheville area and her mother is from Raleigh, where they live and my wife grew up. We don't hear much of the coastal accent when we are in the Outer Banks, though. More NY accents!

Ironic isn't it, when an American actor plays a British/Scottish/Irish role and they complain about mangled accents, yet when it comes to regional accents from the US, few seem to pay the regional accents any mind. I remember being so impressed with Frances McDormand's accent in "Fargo". William H Macy's attempt at the NoDak accent was OK, but sounded too forced.