WHEN YOU'VE SEEN IT ALL, YOU AIN'T SEEN NOTHING -- EMMY-WINNER DON KNOTTS GUEST STARS -- When cutting-edge surveillance technology fails to catch a thief in the act, Ed must rely on good ol' human ingenuity to crack the case. Elsewhere, Mary (Nikki Cox) and Mike (James Lesure) intervene when a cheating husband is caught red-handed. Meanwhile, when Montecito's grooviest high-roller is in need of vintage duds, only Emmy-winner Don Knotts (as himself, "The Andy Griffith Show") can keep his polyester groove alive. Josh Duhamel, Vanessa Marcil, Molly Sims and Marsha Thomason also star. TV-14