The Predator in the Pool - S5-E18
Continuity mistake: At the very end of the episodes, Booth is holding his beer by his mouth. As the camera does its final change of angle and starts to fade out, he is now drinking his beer, despite an instant cut. (00:41:15)
The Predator in the Pool - S5-E18
Continuity mistake: Booth holds out the cheque for Dimitri Vladov to see. It is either held horizontally or vertically, depending on the camera angle. (00:29:40)
The Predator in the Pool - S5-E18
Continuity mistake: When Booth is holding up Ben's cheque, the way he holds it changes from the front view and the over-the-shoulder view. (00:24:50)
The Predator in the Pool - S5-E18
Continuity mistake: When we first see the skull, it has all its teeth in place. When the skull lands on the bottom of the tank, a top tooth is missing. (00:04:20)
The Predator in the Pool - S5-E18
Continuity mistake: At the start, the woman has her hand on her bag in one shot, but when the changes, it's no longer on the bag strap. (00:00:15)
The Predator in the Pool - S5-E18
Continuity mistake: When Brennan and Hodgins are in the aquarium tank recovering the skull, the hose for Brennan's air starts over her left shoulder. During the first close up where Brennan is actually retrieving the skull, the breathing apparatus has been reversed, so the hose is now over her right shoulder. All other shots the hose is over the left shoulder. (00:06:30 - 00:08:00)
The Predator in the Pool - S5-E18
Character mistake: When Bones and Dr Hodgins, who is proclaimed as a seasoned diver in a previous episode, are in the tank, Bones gives an instruction and Hodgins replies with a thumbs up. Since Bones is diving as well, they both would know from certification (without which neither would be allowed to dive in the facility) classes that a thumbs up is the hand signal for "I'm ascending", not OK or any form of acknowledgement. They either are not certified divers or they should have immediately surfaced. (00:06:30)
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.
It's fictitious. Even in 2005. Even in 2025. There is some data that links certain ethnicities to be able to produce different sounds easier/better due to morphology, bone structure, elevation, etc., but no data has shown any 1:1 relationships to any specific group as human groups overlap over time extensively. Certainly, you wouldn't be able to determine their native language due to a small bone formation in the mouth.