This simple show explains the popular appeal of prime-time game shows in the 1950s: They’re astoundingly cheap to produce, show celebrities in a new and less controlled light, and are light, silly fun to watch. (Last week, watching Martin Short as a gloating winner was almost as much fun as watching Matthew Perry as a morose loser.) Now for the bad news: Such guessing games as Name That Snack Food, or whatever it was called, are nothing more than unimaginative product placement. But what else do you expect from NBC these days?