My long time instructors are American, but I did train under a Korean Master for a couple of years while I was in college. The major difference was that I also had the impression that the Korean was less open to questions form students. It was more of him telling you what to do, doing a few examples and then having the class follow along. Critiques would follow, of course, if needed. You could ask a question or two maybe after class if you still didn't understand something.
My instructors, on the other hand, are more open to students asking questions if they don't understand something. This is, however, not something that should be construed as meaning training just becomes a bull session. I have been in class plenty of times when they've answered a question or two (or three) and when asked something again, simply stated that what the student realy needs is more practice to be able to understand what is being taught. Lots of engineering and science types in their class who tend to want to (over) analyze things if they don't get it on the first or second try so they've had a lot of practice telling them not to get caught up in asking about every possible variable before simply trying to get the technique down.
In my experience, I think it is more a matter of degree than anything else in this area.
Pax,
Chris