Oskar's father gay?
Despite what the director says, it would answer many questions raised in the film if he was gay.
1)One possible reason why Oskar's mother is separated from his father.
2) Why Oskar was giving the stink eye to his father's "friend", when he waltzed in uninvited.
3) The looks exchanged back and forth between the two men who seemed to be just waiting for Oskar to leave.