Continuity mistake: When Bones asks Booth what he's got from Scotland Yard, the handle on the striped bag goes from outside to inside the bag. (00:01:30)
Continuity mistake: Booth gets a bobble-head bobbie and holds it with two hands. However, in one rear shot he is holding him with one hand. (00:01:30)
Continuity mistake: When Booth is handed the Walther PPK the Brit has both her hands on the box. When the shot changes she has one hand on her pint. (00:26:40)
Continuity mistake: When Hodgins is thrown into the back of the bin lorry the position of the blue bag changes between shots. (00:24:10)
Factual error: Dr. Wexler is killed in his flat in Oxford, yet the the fire engine outside his property is marked as being from the London Fire Brigade rather than the Oxfordshire Fire and Rescue Service. (00:04:20)
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.