Other mistake: In the book, the horse is called "The Pie" because it is a piebald, which is a white horse with black spots. The horse used in the movie is not.
National Velvet (1944)
21 mistakes
Directed by: Clarence Brown
Starring: Mickey Rooney, Elizabeth Taylor, Donald Crisp, Anne Revere
Donald Brown: I was sick all night.
Malvolia "Mally" Brown: That's a lie, Donald. You weren't sick.
Donald Brown: I could've been sick if I wanted to.
Trivia: "King Charles," the horse that played Velvet's thoroughbred gelding, the "Pie," was a grandson colt of the famous American racehorse, Man O' War. After the movie, "King Charles" was given to Elizabeth Taylor, who played Velvet. She kept him for the rest of his life.