Oh, the hair...
I can't imagine WHAT were the producers, the director, the "hair people" thinking when they allowed Caron to parade in that ball gown with her hair cropped short - ridiculously short - and with a tiara on the head, no less... It's historically inaccurate (though historical accuracy admittedly isn't Hollywood's strong suit) and aesthetically displeasing.
And that ballet at the end... What's with that?! It was a good ballet, with really good music - but to insert a 15-minutes long ballet scene at the end of the film?!
I can see the pattern: "An American in Paris", "Lili"... but didn't they learn from those two mistakes? I mean the two films were very successful, and rightly so - but it wasn't BECAUSE of the ballet, but IN SPITE of it.
It may sound incredible, but Ella's hair, especially in the ball scene, and that ballet at the end of the film, preventing a natural flow of "events", actually destroyed what should have been a great success. And it's a great pity, because this is by far the most intelligent, humorous and poignant version of "Cinderella" EVER.