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Revealing mistakes
As the Ornithocheirus flies over the mating grounds, it doesn't cast a shadow on the Ornithocheirus on the ground (only on the ground itself).
The shot of the Iguanodont youngsters playing with the Polacanthus has been either flipped, or the Polacanthus decided to walk in the opposite direction for a moment. In either case, it's heading in the other direction again a couple of seconds later.
The Utahraptor puppets and CGI models have different colored eyes.
Shadows keep changing direction in the first scene with the Iguanodon.
Utahraptor is shown in Europe, but has only been found in North America.
Ornithocheirus is not the largest pterosaur ever to have lived, as the program claims - that title belongs to either Quetzalcoatlus (which appears in the documentary and is described being bigger) or Hatzegopteryx. It is unlikely that Ornithocheirus' wingspan could reach 12 meters. The largest known specimen only has a wingspan of 6-9 m. The specimen on which the show's size estimates had been based weren't properly described until more than a decade later.
According to the narration, Iguanodon were the first dinosaurs capable of chewing effectively, but much earlier dinosaurs could also do that.
According to the narrator, the pterosaurs' wings were made of thin, easily damageable skin. In reality, their wing membranes were a complex organ with muscles and stiffening rods supporting them, and were much more durable than simple skin.
Male Tapejara (nowadays classified under Tupandactylus) are shown with prominent ridges in their crest, but the fossils preserve no such features, and they were in reality flat.
In the first Iguanodon scene, some of the creatures' feet are not touching the ground.
In various shots, the long fingers of CG pterosaurs pass through their wings.
The Polacanthus' spikes keep "sliding" up and down on its shoulder as it walks, when they should be stationary.
Some of the Ornithocheirus at the mating grounds are transparant.
In one scene, an Iguanodon starts running and leaves distinct footprints in the sand. However, when it is about to start running, there are no foot prints behind it at all, as if it had been standing there for days.
When we first see the herd of Iguanodons walking along the coast line, one of them wanders off to the left, and it's missing its right hind foot, with its leg ending in a stump. The animal isn't shown limping and the narrator never comments on this, so this is most likely an animation error.
When the young Iguanodont nudges the Polacanthus, its arm doesn't cast a shadow over the Polacanthus' backside.
During one of the flying shots, the body of Ornithocheirus overlaps a lens flare.
When the Polacanthus walks past above the camera, the texturing on one of its scutes suddenly changes.
In the first closeup of the living Ornithocheirus' head, part of the puppeteer is visible on the bottom right corner.
Similar to how the American Utahraptor is shown in Europe, the European Polacanthus is also shown in America. Had the filmmakers switched these two scenes around, this wouldn't be an error.