The dress worn by Mrs. Trenchard at one point is the same as Margaret Hale's in the ending scene in North and South.
The inside of Charles Pope's cotton factory is the same shown in episode 1 and 4 of BBC's North and South.
Whilst Lady Maria Grey is being wooed, her suitor suggests that he would fight through the valley of death for her. Ella Purnell, who plays Lady Maria Grey, shot Belgravia alongside Army of The Dead. The plot of Army of The Dead focuses on her character's father and his efforts to reach her in a Las Vegas filled with zombies, literally a valley of death.