Although Jasmine the Lion is frequently said to be old and weary, Taureg, who played Jasmine, was a young lioness, less than two years old (lions in captivity can live up to 20-22 years). This is stated in the DVD special features.
EASTER EGG: On the special features side of the DVD, go to the deleted scenes section. While at the top of the list, press the "up" button on your remote control and a star will appear and be highlighted. Press the "Okay" button and a clip of outtakes will come on showing all of the filmmakers' attempts at trying to put the rooster on the pig.
Haley Joel Osment was contracted without knowing which studio would make the movie and who were the other main leads. This was against standard Hollywood practice and surprised Eugene Osment (Haley's father and manager) at first, but he agreed to "use" his son to get the remainder of the cast and the studio.
In the fight scene with Robert Duvall against the four teens, one of the actors, Travis Willingham, was hit three times in the face by Duvall. Due to a miscommunication, Duvall reportedly told him afterward, he thought that Willingham was a stunt man and that he, Duvall, was supposed to hit him. The cut used was the final one when Travis' nose finally started to bleed.
EASTER EGG: On the DVD Special Features menu, go to 'On The Set with Secondhand Lions' and then press left. A short bloopers reel is shown with Haley Joel Osment and Nicky Katt in the barn.