None of the cast members appear in every movie. After the first most of them were replaced, and Frank Welker came close, but was absent from The Land Before Time XI. See more
When Ducky discovers Spike in his egg, Spike is portrayed as perhaps only two or three times the size of Ducky. However, the next shot a few seconds later shows Spike coming out of the bushes at a size much larger than that. (6 or 7 times the size of Ducky, a state in which he remains throughout the rest of the movie) See more
Once upon this same earth, beneath this same sun, long before you, before the ape and the elephant, as well; before the wolf, the bison, the whale, before the mammoth and the mastodon, in the time of the dinosaurs. Now the dinosaurs were of two kinds. Some had flat teeth, and ate the leaves of trees, and some had sharp teeth for eating meat, and they preyed upon the leaf-eaters. Then it happened that the trees began to die. The mighty beasts who appeared to rule the earth, were, in...