I think the very ending comes off as silly even though I like the idea of it. That final scene could have been earned a little more considering the buildup, but it's a hell of a buildup.
Nothing happens for an hour. Then one thing happens and someone makes a knee jerk reaction. Then one no one talks about either the thing that happened or the the reaction to what happened. Hard to say since no one's talking. Then nothing happens for another hour until there's an awkward moment. Then nothing happens at the end. I was riveted.
During the Q&A after the movie, one gentleman told the director that he needs to tweak the screenplay a little before he sends it to the big multiplexes, and then proceeded to talk about a script of his that he plans to shoot this year and get into next year's festival. He plans to get a bigger star than Jason Schwartzman. The director nodded and said, "okay."