One difference between Cocteau's film "La Belle et la Bete" and Beaumont's version of "Beauty and the Beast" that I found interesting is the evil stepsister's role in the final outcome of the tory. In Beaumont's version, the sister's jealousy makes them shower Beauty with flattery and love to entice her to stay longer than her promise, letting the Beast die in grief or eat her up. In this version, the sister's are already married, but they are still jealous of their younger sister. However, in the movie, the sister's take a much more active role in the destruction of the Beast by persuading their brother and his friend to find and kill the monster, stealing Belle's gift in order to do so.

Nevertheless, it seems that the sister's punishments in each story do not correlate with the severity of their actions. When they simply entice Beauty to stay home longer, a fairly harmless crime in comparison to the movie, they end up as statues for an ambiguous amount of time - perhaps forever. Nevertheless, in "Belle et la Bete" when they steal and manipulate others to physically kill Beast, their punishment is carrying the train of their sister's dress. 

In my opinion, it seems like their punishments are reversed in terms of severity. Not really an important aspect of the two versions, but I thought it was an interesting note.