Nearly 60 years after discovering “The Dick Van Dyke Show,” I still watch the classic sitcom, but some of the punchlines haven’t held up particularly well. Or maybe I’m the one who hasn’t held up so well. You may recall that gag writer Buddy Sorrell (played by Morey Amsterdam) always made longsuffering “Alan Brady Show” producer Mel Cooley the foil of his rapid-fire baldness jokes. The zingers …