By BOB ANDELMAN I’m gonna be honest with you—I’m far more interested in talking with Guillermo Diaz about his last role—as, curiously, “Guillermo”—in “Weeds,” in which he played Mary Louise Parker’s drug dealer, teacher, friend, antagonist, protector—hey, it was complicated. That Guillermo was one scary mofo. This Guillermo is starring as Nurse Angel Lopez on the new NBC drama “Mercy,” which airs Wednesdays at 8 p.m. It’s funny and awkward at times—just like “Weeds,” in some ways—but I think...
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