So Littlefoot finds the Great Valley by climbing over a mountain and ending up on the waterfall side, right? Then they all enter through the cave on the opposite end of the valley, right? And the final cut combines these versions, RIGHT?!
Guess what? I found a new background that wasn't shown in the movie.
In the storybook "Search for the Great Valley", there is a still that shows the cave end of the valley. You can see the waterfall on the opposite side. Furthermore, the rock in the grove of "( )"-shaped trees where they hug at the end is visible.
Why did I not post this in the cut scenes topic? Because I wanted to brag, of course!
. . . Just let me have this one accomplishment.