Should this have been done? Probably not. It wasn't genreiste enough if you'll pardon the barbaric coinage. Certain indifferent novels can be made into films that piggyback on the signs and signals that are well established. We know how to read them and their blandness is an appropriate lack of a barrier to the interpretive glossary. A good novel is its own world with its own climate and the translation to another medium leaches out the texture. They replaced the Freudian psychology of the book with visual signals. The Campbells house is furnished in shades of brown, not even good Grand Rapids whilst the Wheelers are into pale Dano-Scando. It's probably marks the difference between a comfortable sofa and a statement about your taste.
It may well come to pass and perhaps it already has, that Freudian Depth Psychology will be studied as a branch of literature or a vade mecum for 20th.Century studies. It's a verbalising technique; consider the key practice of free association. We lie down, we become embalmed in archetypal stillness which is essentially Cartesian and therefore at odds with the dissolution into imagery of film. The motivation in the book is soluble in this medium.