Northfork is not an inscrutable mess. Whether you wish to view the more fanciful scenes as literal or the product of a dying boy's imagination, one strong theme connects all the stories. Change happens. Each sub-story revolves around a profound change. The little boy is dying. The town is being evacuated. The movie illustrates how we get dragged along by changes we are powerless to stop. We should ideally make the best of them and accept whatever heartache they cause. Some look forward towards a new freedom (the little boy) and some obstinately refuse to accept them (the ark family). And Walter has to learn the lesson that there are some changes we think are over and done with that must be relived (reburying his wife). Just because we think we've buried a chapter in life under the ground doesn't make it so. This is shown so clearly by the conversations between Walter and his son Willis. I say that if you really want to know what the movie is about watch the scene that begins in the outhouse. And pay special attention to the Willis's speech about caring for his car. Its a beautiful movie that gains meaning for me every time I watch it.
Review of Northfork
