Trivia: The saddle worn by Seabiscuit for some of his races is, in fact, the same saddle worn by Phar Lap, who was Australia's, if not the world's, greatest racehorse ever. Billy Elliot, who rode Phar Lap to victory in the Agua Caliente (the world's richest horserace at the time), gave the saddle to George Woolf after Phar Lap died (under mysterious circumstances) in California.
Trivia: Many of the close-ups in the movie were filmed with mechanical horses attached to the truck with the camera so that the background would look right when you see the actors going by trees.
Trivia: The jockey at the crude outdoor race track that Pollard watches as a kid is wearing the same clothes he wears later on in the movie.
Trivia: Charles Howard (Seabiscuit's owner) married second wife Marcela Zabala Howard. Marcela's sister, Anita Zabala, was already married to Lindsey Howard, Charles' son. Though the movie never mentions it, Charles Howard actually had three sons from his first marriage not just the one who died (who was not as young as depicted in the movie).