First of all, you confused the school principal in the radio scene with the rabbi at the end. That scene was on a weekday, not the Sabbath. Next, the rabbi's lack of response is the answer itself, that the best answer is not to question. That comment about women being "too smart" in this movie is blatantly sexist. Watch the movie again if you think there are any "superfluous, purposeless episodes" because there aren't any. The movie is beautifully, purposefully crafted from start to finish. The script was not "thrown together." By denying that this movie has any philosophical or spiritual value It's clear to me that you didn't understand the movie, which is fine, but then don't write a negative review of it, watch it again. The Coens are not "clueless as to how Jews really talk." As a Jew I found this movie to be the most accurate representation of what it is to be Jewish that I have ever seen. What seems like them "not caring about Jews" is really just a deeply penetrating and intelligent self-satire that you didn't agree with or understand. So watch it again.
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from the article: Analysis / The Coen brothers just don't get Jews