Some anachronism-for instance "factories" are spoken of, and even if large workshops in this time period could be considered factories (I don't think they can, because large scale production by itself does not equal the type of mechanization we normally associate with factory production), the use of that word over-stresses the ideological points the book is trying to make. There was some other modern language, and I also would have liked more Latin to be used, especially instead of French words like "Helas".
The Gallic sense of honor also seems implausibly exaggerated, but then when you remember that this is narrated by the characters, you have to realize they would have narrated this way.
BUT with all those very minor (albeit drawn-out) critiques out of the way, it was a fantastic novel and strongly makes the point of how slavery affects the human spirit. The author's compassion is also apparent and I like the realism, which so vastly sets it apart from other historical fiction of its period or any period. It is also conveniently short!