A brief skip back to the accent thing. Hugh Laurie excepted there are few British actors who are able to do American body language well. It's the same with American actors doing British. The accent can be perfect but the movements are not right. I can spot my American husband in a distant group of Aussies by the way he uses his body while he's talking. It was a weird experience losing him in the crowd while visiting his home country.
I's not just about the sounds we make.
Cheers, Joy