Cal Hockley: You're going to him? To be a whore to a gutter rat?!
Rose: I'd rather be his whore than your wife.
The lake that Jack told Rose he went ice fishing on when she was threatening to jump is Lake Wissota, a man-made lake in Wisconsin near Chippewa Falls (where Jack grew up). The lake was only filled with water in 1918 when a power company built a dam on the Chippewa River, six years after the Titanic sank.
Gloria Stuart (old Rose) and Kate Winslet (young Rose) were the first two actresses to be nominated for an Oscar for playing the same character in the same movie. Kate Winslet did it again in 2001, when she was nominated Best Supporting Actress for Iris, as she played Young Iris Murdoch, while Judi Dench played Old Iris.