The Widow's Son in the Windshield - S3-E1
Continuity mistake: Just as Booth learns that a cannibal has eaten the victims face, the amount of sandwich he has left changes between shots. (00:05:40)
The Widow's Son in the Windshield - S3-E1
Continuity mistake: When Booth and Cam are talking about hiring Clark, Cam has her hands in a bowl of peanuts in one shot and holding a beer bottle in the next. (00:09:10)
The Widow's Son in the Windshield - S3-E1
Continuity mistake: In the interrogation room Booth shows the girl a picture of her and the victim kissing, and he then clasps his hands together. However, when we see Booth on the screen behind the glass which is a live feed of what's happening inside the room, his hands are clasped.
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.