Accent Jim

Undertaking Betty (2002) takes place in a village in Wales and includes quite a few big names, learning the Welsh dialect.  Alfred Molina, Brenda Blethyn, and Naomi Watts all do good work overall, but the smaller roles in the film, as well as the ever-amazing Lee Evans, are perhaps the best examples to base your dialect work on.  Evans was born in Avonmouth Bristol, which is very close to the Welsh border, which may have helped him further.  Christopher Walken played an American undertaker, but his New York City accent - he was born in Queens - didn’t come off as anything like a Milwaukee accent, where he claimed to go to mortician school… but his hair made me forgive him.