The timeline has also changed from the linear and chronological approach in the books, as it tends to jump backwards and forwards.
Still, fans loved seeing the talented young actresses, Ali Skovbye and Roan Curtis, play Tully and Kate as teenagers.
Another storyline that shocked fans having watched the series is Tully’s pregnancy, as she does not get pregnant in the book.
The costume designer for the series, Allisa Swanson, said they were welcome changes as it meant the series could have a future.
She told Express.co.uk: “I think it turned out really well, I read the book before we started the series because it was like research material.