The movie is loosely based on an actual horse who was thought to be so unfit and feeble that she almost did not sell at all as a 2 year old prospect and ended up selling for a paltry $9,000. Luna went on to win 13 races and $800,000 in prize money during her 5 year racing career. Just before the closing credits of the film, Luna's final race from 2009 is shown.