The scene where Jimmy walks out to the mound for the first time at The Ballpark in Arlington was filmed during the seventh inning stretch of a real Texas Rangers game. All of the pitching shots were done after the game.
When Jimmy says to Brooks, "You know what we get to do today? We get to play baseball," it is a reference to a deleted scene, where Brooks tells Jimmy how his father said the same thing before every game he would play as a boy.
Dennis Quaid did much of his own pitching, but he was doubled in shots that required truly fast pitches, by former minor league pitcher Jeff Dowdy. No special effects were used to enhance the speed of the pitches; however, some camera tricks, such as "whip pans," were used to make Quaid's own pitches appear faster.
Brian Cox who plays the father of Dennis Quaid in this film is actually less than eight years older than Quaid.
Jim Morris was 35 when he was signed with the Devil Rays organization. Dennis Quaid was 47 when the film was shot in 2001.
Jim Morris: In the district championship game, with the Owls down 2-1, "Wacko" Campos is up to bat, and sends an extra-base hit to right field that scores the tying run, even when third-base coach Jimmy Morris tries to hold the runner. In two shots, the real-life Jim Morris and his wife Lorri (both wearing sunglasses) are cheering the team from behind the backstop. He has a mustache, and is wearing a gray t-shirt.