The Rosie O’Donnell show was supposed to be the magnet that would draw big numbers of viewers to Oprah Winfrey’s OWN cable network — before it ended up a big flop. Insiders blame the failure of the show on a lack of support from the network, and a lack of experience on the part of Winfrey’s Harpo-based team doing anything other than a show built around Winfrey. “Initially, we had a lot of support,” says one show insider, who can’t be named because of a confidentiality agreement. “The first week we heard everything went well. But after the premiere week...