GREY'S ANATOMY - "An Honest Mistake" - SGH legend Dr. Margaret Campbell trades barbs with Cristina, on "Grey's Anatomy," THURSDAY, FEBRUARY 19 (9:00-10:02 p.m., ET) on the ABC Television Network. (ABC/RON TOM) SANDRA OH, KEVIN MCKIDD, FAYE DUNAWAY, SARA RAMIREZ