These are from the late 90s.

http://video.google.com/videosearch?q=don+knotts (http://video.google.com/videosearch?q=don+knotts)

http://video.google.com/videosearch?q=andy+griffith (http://video.google.com/videosearch?q=andy+griffith)


And miscellaneous bits on bottom of this page.
http://video.google.com/videosearch?q=ron+howard