The saddle worn by Seabiscuit for most 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.

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.

The Pimlico race track shown in this movie was not really Pimlico at all. The track the producers chose to represent what Pimlico looked like in those days was far from Baltimore, Maryland. It was the Keeneland race track in Lexington, Kentucky.

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.

The races had to be re-shot numerous times because the horse playing Seabiscuit constantly lost them.