This is a two-hour special, but it needn’t be. The truly great halftime shows over the past 50 years easily could be highlighted in a one-hour special – and the most famous halftime show of all, featuring Janet Jackson’s 2004 wardrobe malfunction, still won’t be shown again by a broadcast network in unedited, non-pixilated form. The reaction, and overreaction, to that particular Super Bowl halftime event was astounding. So many members of the media and government used the term “wardrobe malfunction” in the days and weeks following that “shocking” live TV event, it bordered on the absurd. If I had a nipple for every time that phrase was used back then…