Your opinion isnt canon

I thought you meant the joke was that she was breathing into the bag witch was breathing into discord and then reversed. Like it was a joke we could only see when we compared the two clips, and that the writers did it on purpouse.We all know the reason they had her play celestia in this episode is mostly that they already had a fluttershy model with a celestia costume, so they didnt have to make a new costume for someone else.