I actually liked the razor moment. It doesn't seem all that unlikely that a family heirloom would be passed down from father to son over all those years, and it made for a chilling moment when Claire realized the razor being used on Black Jack was the same one she'd used on Frank.

Definitely fiction. Geoffrey Ward talked about the inaccuracies on NPR. http://www.npr.org/2012/12/…

Ditto - that was definitely a change for the better.

I loved that moment, too. Dougal almost said it with fondness.

Maybe it wasn't as clear in the show, but in the book Claire mentioned her not being a virgin (something Jamie would've already known, given that she's a "widow") as a last attempt to get out of a forced marriage to him. She hoped that might make Jamie rethink it. So much for that!