Twenty years on, NBC presents a two-hour special with the sort of hyperbolic title that, by accident, mirrors the media mania with the case from the start, when the low-speed chase of O.J. Simpson’s white Bronco sparked the so-called (and so wrongly called) “The Trial of the Century.” This special recounts and condenses it all, and also provides some new interviews – but the closest it gets to a “key” source is Simpson houseguest Kato Kaelin, getting his 15 Minutes of Fame 2.0.