I caught a scene from a film on some kind of station a while back. It had Isabella Rosselini, lying on a gigantic stomach. I later discovered that the movie was "My Dad is 100 years old" by Guy Maddin, which is a documentary about Roberto Rosselini, but I only saw that one scene, and can barely remember it. But in the scene, Isabella says something like: "My father would always shoot his characters with their faces in the middle of the screen, without moving the camera. Anything else, he would say, was pretentious." I wish I could remember the exact quote, but that was the gist of it. I like this idea a lot - pretentiousness as some kind of superfluous formalist overreach.
The other idea of pretentiousness which I have is from the film "The Day the Earth Stood Still." The new version. A really great film - unfairly maligned. Anyway, the plot of the film is that a super-powered, super-intelligent alien comes to earth to decide whether or not the human race is worth saving. Ever since I saw this film, I thought - pretentiousness is a test of what you would say to the alien, and how you would say it. The alien, of course, you can't bullshit, and he would be completely unimpressed by any superfluous flourishes, whether theoretical, rhetorical, or whatever.