The Cersei/Jamie scene was definitely changed, the Craster's scenes were not a focus in the book - most of it was made up, but the show runners have to show us rape, rape rape and add the threat of rape to Meera last week - which never occurred.
What is one to think when they add/change so many scenes by adding some more rape other than that they are exploiting it because they can. Wow - how cutting edge of HBO.
I just found this Wired writer last night who does great recaps on GoT and notes the differences between what is in the books and the show. Her comments about Craster's:
"The story North of the Wall has become my own tiny, personal version of The Walking Dead, not just in the sense that there are zombies but also that it has gradually become so tediously brutal and pointless that I actively do not want to watch it anymore. And yet, here at I am, heading back yet again to Crasters Keep for another fun scene with the mutineers. If you think that means more rape, you are of course right. After several other ambient rapes, Karl and friends decide to rape Meera in front of her brother and Bran becauseI dont really know why? Because Game of Thrones? Its like every time they need to ratchet up the tension for a female character, someone in the writers room spins a giant Wheel of Fortune where 80 percent of the spaces read RAPE and the other 20 percent read KILL HER CHILD. Spin the wheel of bad things that relate directly to your reproductive organs, ladies! Its anybodys game!"
http://www.wired.com/2014/05/game-thrones-recap-episode-5/