I'm currently listening to the audiobook version of Equal Rites. Haven't read or listened to it for years, and cannot believe how many small differences there are in Granny Weatherwax as a character.

For instance, she goes to Ankh-Morpork without Nanny Ogg (who isn't mentioned at all in the book, not having been introduced at this stage by PTerry). Fair enough, he had not come up with Nanny by then, but if it were a later book, Nanny would definetly been by Esme's side (as similarily seen in Witches Abroad I suppose) or at least had a big argument over why she should come!

Overall, I like these differences as I can see the evolution that Granny's character takes.