A relatively minor nit considering it's a Takashi Miike film... but how is the mangled guy in the burlap sack able to swallow without a tongue?
In that case, shouldn't most of the people on the Tongue Trauma page have starved to death after the incidents listed?
To be fair, this guy showed up out of nowhere while the main character was drugged and then disappeared again. We don't know that he exists.
From what I hear (I haven't seen the movie...yet) she feeds the man in the burlap sack her vomit. I don't know if this is his usual diet, but I would feel you could swallow (semi)liquids without a tongue, albeit with difficulty.
How did Aoyama manage to speak with the guy in the wheelchair when he was looking for Asami, given that Asami had already sliced off his head with piano wire?