I know they can't include everything from the books or we'd still be watching this series in 50 years (which would be OK with me!), but I did miss two parts in particular. First, I missed seeing Jamie and Jenny go at each other in the other room, while Claire meets Ian and Ian is completely nonchalant about their fighting and gives her advice about staying out of their way. I know they talked later in the episode, but I really liked that scene in the book. I also missed Jamie telling Claire about how he was completely over-the-top insulting to Jack Randall when he proposed dropping the second flogging in exchange for giving his body to Randall. He told her how he was extremely nasty to Randall so that he wouldn't be able to change his mind - a scene I found really endearing in the book and missed in this episode. Like I said, I know they can't all be there - but I really missed those two scenes in particular.
Edited to add - I keep thinking of more I missed from the book. Particularly Grannie MacNab's role in the incident at the water wheel, and how she convinces Jamie to take Rabbie into the big house by wearing him down while he is naked and freezing in the water. Loved that!