I'm usually fairly forgiving of adaptations of books, I don't expect them to be the same. But what the heck was that?
So he was actually dead, and was reliving the worst moment of his life where he killed in a fit of jealous rage the woman he lusted after.
But when? Usually when you have the 'actually dead but didn't realise it' plot the writing has been made so that it's clever enough for the viewer to look back in hindsight and note the point where they died, as well as bits that didn't actually happen because they were dead and imagining it.
Was it actually him that was found dead not the second wife? Was the orgy in his head, and then he realised it was the shopkeeper. But then did the shopkeeper actually die? What was the point ig the witches? Why did we see them at the hospital or even the burial of the aunt ? (When they apparently did leave their house or not leave the that's-not-Surrey-village.)
What was the point of the girlfriend of the usless money grappling nephew flicking ash everywhere? (Possibly to show how unappreciated the second wife was?)
Also what was the point emphasising the total opposite ness of the two wives? (First one he adored/lusted for but he angered at her not adoring him (so he perceived) and she didn't do anything like cook or sort out thier apartment. Second wife he didn't love but didn't everything '50s wife' correctly.