This clip job represents the latest TV fad: junky specials combining bloopers from old TV shows. Excerpts from Your Show of Shows, The Dick Van Dyke Show, The Honeymooners and All in the Family are fun but familiar. Those who watched the 1980 special 30 Years of TV Comedy's Greatest Hits may think it's all too familiar. And they'd be right. The new show is merely a one-hour edited version of the old one.