Here's behind-the-scenes footage from The Andy Griffith Show with Andy, Ron Howard, Don Knotts, Frances Bavier and all the rest, including my beloved neighbor, Betty Lynn. This is home movie footage taken by Ron Howard's family, which would explain why the camera lingers so much on Ron and his younger brother, Clint. Hey, there's something I have in common with Ron: I have home movies with Betty Lynn in them, too. Thanks to Edward Fields, who told me about this video…