I think it only served to confirm how entitled he believes himself to be. Whilst I'm not sure that probing "Royal" interviews ever work out well, his demeanour was vastly different to that of Princes Diana's when she did hers. One probably garnered even more sympathy,(rightly or wrongly) the other saw one of the late Queen's sons pretty much booted out into the salt mines!
Good casting - I thought it quite ironic that the guy who played Stewart, the producer, also played the original Prince Harry in The Windsors (in which he was utterly brilliant if you like irreverent humour )