Remarkable that at one point before the leaders teed off there were four amateurs within three shots of the lead! Pity that Dunne started so shakily, but no one was surprised and he has nothing to be ashamed of considering what he was thrust into.
One thing I thought after yesterday's round is "why he doing interviews?" If I was his caddie, I would have asked him, "do you want to do interviews today, or should I tell them to wait until after the final round because that's what I think you should do". That, and signing all the autographs the next day - I would have run interference for him and told fans he'll sign all the autographs you want after the final round but he needs to keep his head in the game by going through his normal routine, and no one has ever asked him for his autograph before unless they thought he was Jordan Spieth!
It would be hard enough to get any sleep holding the 54 hole lead as an amateur, but making the experience even more surreal by doing TV interviews that will show to a worldwide audience and being mobbed by the fans takes things up another five notches and greatly reduced the level of normalcy of the whole experience.
I suppose in some sense, since he didn't distinguish himself as an amateur all that much so far, maybe you want him to experience all that because he may never be in that position again. I just don't think it did his golf game any favors.