Camilla was the main one. Everyone was left with the impression that Charles and Camilla had never broken off their relationship and that that meant that Charles's marriage to Diana had never stood a chance. That wasn't quite true.
I don't think Diana needed that much persuading: I got the impression that she wanted to have her say. It'd be interesting to know whether any of her friends and family knew that she was doing the interview, and whether they tried to stop her, but it's all water under the bridge now. However, that doesn't take away the fact that Martin Bashir made up a lot of lies, and caused a lot of hurt to Tiggy Pettifer, who had nothing to do with any of what had happened.
Had Diana not been in such a bad place mentally, maybe she'd have been suspicious about what Bashir was saying, but, again, it's all water under the bridge now.