On an episode of The Rewatchables podcast earlier this year, Wesley Morris cast Rachel Getting Married as a fascinating, not-unworthwhile, but ultimately unsalvageable result of the clash between two wildly different sensibilities: that of the script, by debut screenwriter Jenny Lumet, and that of the director, Jonathan Demme. The script is dark and pessimistic; Demme, often called a humanist -- as opposed to a misanthrope, I suppose, but the term still feels vague -- is the ultimate optimist. His movies…