in american movies (animated) all the voice work is done first (like for finding nemo, skrek, ect) where as in japan the voice work is done after the animation. because of this difference you'll notice that the amican charcters seems to be more life-like and responsive and involved with the diolouge. even when you compare something like spirited away to finding nemo, you'll notice how much better the actions and animations and expressinos of the characters fit the diolauge withe the american films. the american animators get to listen to how the actors interpreted the lines, they listen to each line over and over, till they can craft the expressions and movements around the lines ... this makes for a more seemless experience. ^ that was me paraphrasing some comments i heard by a group of animators and animation film critics when i was listneing to npr. i had never really thought about it, but i think they're correct. while it adds a kind of surreal quality to the film, there always seems to be a slight disjoint between the japanese charcters and their lines.