If you’ve never heard of Roy Clark (who died yesterday at 85), or only know him from his 24 years hosting “Hee Haw,” watch this to see what a versatile guitarist he was. It’s a montage of clips from a 1975 episode of “The Odd Couple” which was built entirely around him, and gave him virtually a third of the show to demonstrate his talents. I can’t think of another sitcom episode in which the two stars (Jack Klugman and Tony Randall, in this case) stay quiet while their guest star takes the spotlight for this long…