** Nobody Walks A tale of funky, upscale LA marriage and infidelity, Ry Russo-Young’s film has good performances (by John Krasinski, Rosemarie DeWitt, and Olivia Thirlby) and a coolly observational tone that blunts the dramatic urgency. Co-written by the director and Lena Dunham, this could have used some of the acid truth-telling of Dunham’s “Girls.” (83 min., R) (Ty Burr)
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