I think that this film was meant to be realist and naturalistic. However,there is the reality that this is an entertainment, and the audience has to hear and understand the lines. Supervigilance is required to do this in this movie. Not only does JJL's imitation of Dorothy Parker's speech affectations make the speech and musing of the main character difficult to understand, but the inclusion of background noise, overlapping dialog, and frequent muttering and mumbling of the performers make every character difficult to even hear, much less understand.
Since so much of this movie is about legendary people mouthing famous aphorisms, it is frustrating to only hear snippets of their lines. I suppose the idea was to toss these famous lines away to add naturalism. However, without spotlighting the conversations of the legendary characters, however contrived this might be performed, this is just a very sad movie about a bitter, unhappy, self-destructive, unproductive writer. Not very easy to watch nor very interesting.