What’s the most significant event in U.S. history? The Declaration of Independence or victory over the Nazis, you might answer. What’s the greatest event in pop culture? The 1980 U.S. Olympic Hockey victory over the Soviets in the Lake Placid Semi-finals, you might say. Well, you would be wrong. At least, according to “8 Mile” and “24” producer Brian Grazer and his co-horts in the production of “Inside ‘Deep Throat’”. To them, “Deep Throat,” the notorious porno flick about oral sex, is the greatest moment in U.S. history. At least, you’d think so, if you saw this absurd “documentary” about...