Outstanding comedy (with a healthy dose of drama) about small-town waitress Keri Russell; trapped in a terrible marriage (to abusive Jeremy Sisto), she’s just found out she’s pregnant. Mostly a character study–Russell’s phenomenal. Great supporting performances: Cheryl Hines, writer-director Shelly (Russell’s waitressing comrades), Andy Griffith as her favorite regular; Sisto’s terrifying. It’s got third act…