There are no inconsistencies in the Discworld books; ocassionally, however, there are alternate pasts.
Terry PratchettBut there was more to it than that. As the Amazing Maurice said, it was just a story about people and rats. And the difficult part of it was deciding who the people were, and who were the rats.
Terry PratchettI don't think I've ever been critical of the money Douglas Adams makes, especially since, as has been tactfully pointed out, I myself have had to change banks having filled the first one up.
Terry Pratchett