I have gone over and over this scene and if you lisetn carefully you'll find that Hermione doesn't say Rupert she calls Ron then calls him Ronald which if you hadn't noticed is his characters name and they call him Ron for short. It would make sence as she calls him Ronald many times in the movie.
Um, actually, if you don't mind my wanting to slap you, the bear in family guy's name is Rupert. And if you were being sarcastic, i want to slap you more because you should know it's impossible to tell through e-mails, letters, or any other form of type. :-)
Anywho, I have never noticed this and have watched the movie WAY too many times. Also, if she had yelled out "Ronald!" it could be mistaken.