It seems very strange the way so many American actors find it impossible to learn how to do authentic accents. Though maybe its not their fault - perhaps they have to adjust their accents to fit some preconception of what audiences want. (The way that in "Frasier" they apparently imposed that weird "Manchester" accent on the actress playing Daphne, even thogh she's perfectly capable of doing a genuine Manchester accent).

Why would anyone expect to get bluegrass music in a drama set in the 1870s?