Any guesses on what might go wrong?

Now I am not wishing for a mistake. But one has to think with the ridiculous number of names the average member of the Royal Family have- their might be a repeat of the Prince Charles/Princess Diana wedding name switch. Update: Seen William and Harry now. William looks dashing but is really suffering from hair loss more than I had noticed before. Harry- such a looker but looks quite wide in the upper body in the uniform. I worry he has the look of the crazy gym rats. Hopefully just the wrong camera angle doing that.