Thanks for feedback.
I thought the cow(Hilda) would be funny as a break between more serious parts. I can see how her random humor would seem overwhelmingly out of place.
The whole idea of the ending, from what I understand, is that the dust bowl manifests itself as an entity to take everything that Bill has left. It takes his daughter, and then even Hilda leaves(which is supposed to be more comedic). Though we don't get to see the horrible thing Bill did to deserve such fate, so it doesn't have as much impact.
That's my interpretation, but I only wrote the cow parts.