Honestly, I think that first image is taken from the scene where Sharptooth is about to fall off the cliff during the Great Earthshake and tries to eat Littlefoot and Cera when Littlefoot's mother whips him off the ledge. It explains the rubble you see on the ground. The way each piece of rubble is positioned, it looks like it's moving to the right, which is impossible because there is no obvious slant in the ground and it doesn't look like anything is visibly moving it away from the left.
The reason why it looks different is because the image was slanted straight, if you understand what I mean.