Not sure what you mean here - the first three fifths of the movie is all dream logic insofar as the characters we see represent the emotions and aspirations of the Naomi Watts character we see in the final two fifths.It'd be too much for all of the dream scenes to be filmed in the surreal manner of the Silencio sequence because we wouldn't get as involved in the narrative. We'd feel like nothing matters. And, Twin Peaks aside, it's never been Lynch's style to make it obvious what's real and what isn't.