It's all just a big narrative anyways...

On a very simple level, a narrative film would be considered any film that tells a story. With that said I could see the argument in saying that "Duck Soup" provides an intervention into narrative film with the fact that all of the stunts and skits that they have laid out, are laid together with script to provide a story. I would say that it is an intervention into narrative due to the fact that it is obvious that these skits where put together before there was a story. I'd assume that the story was loosely woven around the acts or performances that they felt they wanted to display, and in this manner they are offering a different strategy, if you will, on storytelling. The acts that they perform, merely build the background of the specific players or actors in question. These types of Marx Brothers films rely heavily on the foundation of the characters themselves and the stories usually are second to the performers themselves.
On the subject of suggesting that the film, "The Way Things Go", is a narrative, I would agree that it suggests that there is a linear plot to the film. I would only go as far to say that this is linear film as opposed to non linear film only because it is apparent to the viewer that this film is following a path of sorts. In this case it is almost recounting the events of this "Rube Goldberg" type setup. Looking back I would say that calling this an intervention into narrative film would be an interesting take on the film itself, however I try to avoid being concerned with the labeling of projects. The more I keep typing the more I like considering this film as an intervention, mostly because I think that the strong linear feel to the film would back up many points made to say that it is indeed narrative. I now believe that it is narrative. Seriously though, everything is narrative to the viewer, because the viewer creates memory of what they see and in this way they are creating their own story, if they choose to recall the information that they have stored as a memory. Mood alone would dictated the narrative of their memory itself.
Well that's it, becoming a little florrid.