The Drama in the Queen - S9-E23
Continuity mistake: When we see the mum climbing down the ladder at the start, the way it's attached to the side of the well changes between shots. (00:01:40)
The Drama in the Queen - S9-E23
Factual error: The IP address shown is not possible. IP addresses are always XXX.XXX.XXX.XXX however we are shown an extra set of digits making it XXX.XXX.XXX.XXX.XXX.
The Drama in the Queen - S9-E23
Plot hole: The bullet that killed the victim had plastic associated with the wound. This was explained by the fact that the bullet that killed the victim hit a lane divider as it entered the water, but at the end of the episode it was discovered that the bullet was fired from under the water, negating the possibility of it hitting a lane divider at the surface.
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.