One of the themes of this episode (and the first season) is the general atmosphere of anti-semitism that pervades the main characters' attitudes and lives. This is referred to both overtly, as when Draper tells Sterling that the firm has never hired a Jew "on my watch," and subtlety, as when the hors d'oeuvre served to Rachel Mencken at her first meeting is shrimp cocktail (shellfish is forbidden under Jewish dietary laws, but since nobody at Sterling Cooper has even rudimentary knowledge of Judaism, they obliviously serve Rachel shrimp anyway).
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