Continuity mistake: The blood drips on the glass in front of Bones near the end has 2 distinctive lines of blood. In the following shots the blood pattern is different. (00:27:20)
Continuity mistake: Hodgins takes the lid off the fish blender twice when trying to find out what killed the fish. (00:32:00)
Continuity mistake: Hodgins goes from holding the jewellery found in the fish tank with one hand to two hands. (00:34:50)
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.