An American Pickle is a Seth Rogen summer comedy, written by ex-SNL writer Simon Rich from his New Yorker story, Sell Out, in 2013. Our film critic, Harlan Jacobson, takes a dive with Rogen into the brine. HJ: It is Schlupsk, Northern Poland, 1919. Look it up--it exists. Herschel Greenbaum is digging a ditch. His life is not so great. When he sees Sarah, a girl who is probably too good for him, he woos her with a smoked fish. A brief role for Succession’ s Sarah Snook, Polish Sarah smiles and