It seems to be a random movie with lots of influences mixed up, classic Hollywood, french and italian cinema, indie and artsy movies, etc.

The Mcguire sequence I see it as a reference to mob and horror movies, besides a homage to Irreversible of course. And the 'creature' they find in the last basement floor of that place is like King Kong, which was coming hot at that time. I also think that sequence wants to talk about how repression can turn men into monsters.

I midly appreciatte it but it would be interesting how would it be if he wrote it more focused and less gross.