“Bird by Bird with Annie: A Portrait of Anne Lamott,” filmmaker Freida Lee Mock's profile of the humorist-author of such books as “Bird by Bird” and “Crooked Little Heart.” Mock follows Lamott as she speaks to various groups, and Lamott fills in details of her life in between. Cheifly among them: her her son Sam; her Christian activism (and her devotion to liberal causes); and her battle with alcohol and drugs. Now she's sober and satisfied. “Being a writer is all I have ever wanted to be,” she says. “There really isn't anything that I want. Maybe a few more CDs.” Mock won an Academy Award for her 1995 documentary “Maya Lin: A Strong Clear Vision.”