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"The Intervention," a comedy about four couples taking a weekend getaway — where one of the couples learns the trip is an intervention on their marriage, made its premiere Tuesday, Jan. 26, at the Sundance Film Festival in Park City. The film, part of the U.S. Dramatic competition, marks actor Clea DuVall debut as a writer and director. DuVall co-stars with Melanie Lynskey, Cobie Smulders, Alia Shawkat, Jason Ritter, Natasha Lyonne and Ben Schwartz; part of the U.S.