When Jake Irons and Brighty are crossing the Colorado River in the cage, Brighty freaks out and starts kicking at the wooden cage door. Before he starts kicking, the door is seen to be firm, intact, and unbroken, but in the shot of his first kick, you can see that before the hoof impact the door is already somewhat broken. See more
This old world has seen a lot of changes since Teddy Roosevelt's day, but his dream came true, and the Grand Canyon will stay the same, as long as there is a world. Brighty has long since left this earth, but some animals, like some men, leave a trail of glory behind them. They give their spirit to the place where they have lived, a part of the rocks and streams, the wind and the sky. Brighty's spirit lives on. Forever wild, forever free.