Revealing mistake: When Shadow and Chance launch the cougar (mountain lion) off the cliff the cougar is completely still, basic instinct for all creatures would be to struggle, indicating the cougar was a fake.
Revealing mistake: Near the start of the journey, there is a shot of Chance and Shadow running through a creek. This is followed by a shot of Shadow coming toward the camera. As she turns off to the left screen, something on the bottom moves with her. It is likely a guide for the cat to follow.