Continuity mistake: When interviewing Rulz, Bones looks at his wrist. In the closeup he is holding a vinyl. Camera changes to show all of Rulz and his hands are now on his knees. (00:17:50)
Continuity mistake: At the start Hodgins passes Bones a folder. Bones' grip on, and the position of said folder changes instantly. (00:05:50)
Continuity mistake: When interviewing Rulz, his jacket is open with the left (screen right) lapel over the of the right (screen left) lapel. During the interview they keep swapping places. (00:33:20)
Continuity mistake: When Booth is showing the belly button ring to Rulz, he holds the bag with the ring on the right side of the bag. Camera cuts and now it's on the left. (00:17:20)
Continuity mistake: When the mummy is discovered in the wall the mouth is closed shut. When the mummy is in the lab the mouth is open. (00:04:30)
Continuity mistake: When Booth is interviewing The Man in the Wall, he is stood to the side of the door. Camera changes and now he is in the middle of the door. (00:33:50)
Continuity mistake: We see Bones draw a chalk outline on the floor and it is fairly faint. When we next see it, the lines are a lot more refined. (00:30:30)
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.