There is a scene where Obelix (played by Gérard Depardieu) hides in the bushes and tells Alafolix what to say when speaking to Princess Irina. This is an obvious reference to Cyrano de Bergerac (1990). The title character in Cyrano was also played by Depardieu.
Pasunmotdeplus is a mute because Brutus cut out his tongue. Yet in the scene where it first looks like he's singing 'O solo mio', you can clearly see his tongue.