The race-course map which Mi shows Velvet is an accurate portrayal of the real-life Grand National course at Aintree, near Liverpool. What's more, like the movie, the course actually has a Becher's Brook jump and a Canal Turn jump with its sharp left turn.
The story that Mi tells to Donald about a shipwrecked horse is based on a true story about a New Zealand-bred thoroughbred named "Moiffa" who did in fact survive his ordeal and went on to win the Grand National the following year. In 1979 Mickey Rooney starred in The Black Stallion (1979), which is about a shipwrecked horse that goes on to win a major race.
Carl and Eleanor Goldbogen appear as extras in the crowd scenes. Carl's brother was Avrom Goldbogen, professionally known as producer Michael Todd, who would become Elizabeth Taylor's third husband in 1957.
The music during the "lobster for dinner" scene between Mr. & Mrs. Brown is actually a very close paraphrase of "Ballet Of The Unhatched Chicks" from Moussorgsky's "Pictures At An Exhibition" as orchestrated by Ravel. Moreover, film composer Herbert Stothart had actually used this exact music chart in 1940 for a sequence in "Pride & Prejudice."
12-year-old Elizabeth Taylor underwent drastic measures to prove that she was right for the role. Velvet brown was supposed to be a girl in her late teens, going through the natural changes into womanhood. Taylor was told by the director that she couldn't be velvet, as she was rather "boyish". This only provoked Elizabeth more; she ate steak everyday, doubled her portion of meals, and rode her horse constantly to train. In three months, Elizabeth grew three inches, and began to gain the natural curves of a woman. For her efforts alone, she won the role.