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The errors from the games have been mostly from players that are playing out of position. For instance, Kataoka is actually a 2B with a junk arm playing 3rd and SS.
Japan has probably actually been underperforming with regard to defense. They've used the worst CFer they have in CF (Fukudome), played a fat toad of a 3B in Murata, constantly start Nakajima (which is fine... if they slid him over to 3B) while nailing their best defensive shortstop (Kawasaki) to the bench, and they left the other awesome MIF in Japan (Nishioka). And Iwamura is severely overrated by his tenure with the Rays.