Madeline is pregnant with Orry's baby.
Goof: Orry is asked to hand over some letters on his way south by a fellow soldier who hasn't seen his wife for 2 years. When Orry tells about this to Madeline, he says that the soldier hadn't seen his wife for a year.
Goof: Orry and two fellow soldiers leave towards Tennessee riding three light brown horses. However, they are forced to turn around seconds after and Orry is riding a dark brown horse.
(After Ashton tells her that she knows about her mother's past and forces her leave Orry)
Madeline: You must hate me very much, Ashton.
(Ashton leaves Mont Royal after attempting against Billy's life unsuccessfully)
Brett: I do hope you have a safe trip, Ashton. Maybe you could stop at that Confederate camp and charm the colonel into giving you an escort north.
Ashton: And if I never see you again, little sister, it would be too soon.
(Billy and Charles come face to face during Antietam Creek battle)
Charles: Get out of here, Billy, before I have to kill you.
Billy: Before I have to kill you.
Ashton: Your mother sold herself to men for money.