During its live coverage of the annual Macy's Thanksgiving Day parade, NBC did not tell viewers that a giant balloon had caught on a street lamp and injured two sisters. At the point in the broadcast when the "M&M's Chocolate Candies" balloon was supposed to have crossed the finish line, announcers Katie Couric, Matt Lauer and Al Roker stuck close to their scripts and the network ran footage of the balloon from last year's parade. Couric told the audience they were seeing old footage and bantered with Lauer and Roker, but there was no further mention of the accident. An...