From what I understand, there's an overseas supervisor whose job it is to know what type of animation the show will require and make sure the inbetweeners in Korea (or wherever) keep to their instructions. As it would be insane for domestic art staff to keep flying back and forth to Korea to make sure they're animating the way they want, this is the only logical process.
However, overseas supervision can be difficult as there's not only a language barrier but a barrier in what is needed for a cartoon to look and move just the way the domestic side wants. There was a post on John K.'s blog a while back (and please, do NOT take this off-topic with bashing/defending/whatever. I'm just mentioning it because it pertains to this topic) where he described what a headache it was to get the overseas studios to give him the results he wanted, as they were so conditioned through the '70s and '80s to animate strictly on-model, and would tone down all his extreme poses and drawings. He basically had to re-train them from the ground up to, if anything, make his drawings MORE extreme.
It arguably wasn't until John K. began outsourcing to Rough Draft in season 2 of Ren & Stimpy that he was getting the results he wanted, as an American founded the studio who had an idea of what kind of cartoony animation was needed, and already had his animators trained accordingly.
