Breaking news events over the past month have wreaked havoc with the presentation of this documentary series – pre-empting some episodes, substituting others, and making it hard to catch every installment. Maybe this will help: a Memorial Day weekend Saturday night compilation of several of the episodes so far, starting at 8 p.m. ET. Scheduled among them: Repeats of the two-hour opener about Eighties television (in which I appear, so be forewarned), and the so-far elusive installment about MTV and the rise of music videos (in which I don’t, but the Buggles and Madonna do).