Continuity mistake: When we see Wendal and Angela in bed, Wendal has his arm up by his head in one shot and lowered in the next. (00:08:30)
Continuity mistake: Wendal says he's worried about Hodgins not knowing about him and Angela. When he does, he's stroking Angela's shoulder with his finger tips in one shot but got his whole hand on her shoulder in the next. (00:08:50)
Continuity mistake: The amount of blood on the breeze block changes between shots when Bones first looks at it. (00:18:50)
Continuity mistake: When Booth gets the print off the block, the tape has loads of black charcoal dust on it. The camera now zooms in and shows a distinctive clear finger print with no excess dust. (00:20:00)
Answer: Since the palatine bone is a bone that helps form the mouth it has a lot to do with speaking. The shape of it differs a lot depending on your ethnic background. I would guess that they, in the show, meant that the person's bone tells that they were Japanese and that it was "made for the purpose of speaking Japanese." That's what I'd assume anyway. I've studied molecular biology though, so I'm not an expert on bones.