Ending
Maybe when he gave her the wooden heart he somehow passed on Fats to her. I dunno. Seems like this is a ambigous ending. We don't really know if the Puppet was really talking through him or not. That's why the eyes moved in that one scene all by themselves, to create doubt. And her high pitch yell and dropping the F bomb had some sort of significance. Or did it....
Laugh it up, fuzzball.