I'm sure it is all taped in advance and edited, they want to get the best product for the public to view. They do things like this when they tape certian ice skating specials. I went to see Smuckers Stars On Ice in Lake Placid-the show they tape and televise later, and after the show ended they did several retakes of certian performances, because people did fall and make mistakes and they have even been known to do retakes the next day and pull people off the street to pose as audience members. So it wouldn't surprise me if they do the same thing with the christmas parade at Disney. I always wondered why those professional skaters never messed up during the TV specials-now I know!!