Continuity mistake: When Aladar is trying to help Eema get up, his eyes turn blue in one shot and in the next, they turn back to the usual green. The same thing happens at the end of the movie, when Aladar's baby hatches out of the egg.
Factual error: The average Iguanodon is estimated to have weighed around 3.4 tons, while Carnotaurus probably weighed about 1.5 tons. By this logic, during the final Carnotaurus encounter, the rocks at the edge of the cliff should have crumbled when Kron tried to escape, but remained intact until the Carnotaur was at the edge of the cliff. This is because the Carnotaurs in the film are inaccurately depicted as being T-Rex - sized animals.
Bruton: Why is he doing this? Pushing them on with false hope?
Plio: It's hope that's gotten us this far.
Bruton: But why doesn't he let them accept their fate? I've accepted mine.
Plio: And what is your fate?
Bruton: To die here. It's the way things are.
Plio: Only if you give up, Bruton. It's your choice, not your fate.