The face of Jeremy/Colargol, the singing bear from a stop-motion animated series produced apparently by the same studio that produced this series, appears as an outline drawing in the opening credits sequence when the fish is transforming into the amphibian and leaving the water.
The first episode, dealing with prehistory, presents many thoroughly outdated theories originating from the early 20th century. While widely accepted when the show was made, they have been overturned by scientific advancements beginning from the 1980s. Among other inaccuracies, it depicts herbivorous dinosaurs as swamp dwellers, proposes the unsubstantiated idea that carnivorous dinosaurs were afraid of water, and claims that crocodiles descended from dinosaurs. Brachiosaurus is said to have been the largest land animal at 50 tons, but modern-day estimates are significantly lower and many larger dinosaurs have since been discovered. The Anatosaurus is nowadays called Edmontosaurus, and while more recent findings suggest it did have a head crest, it probably wasn't as big as the cartoon version. The Elasmosaurus is incorrectly shown with a bendy neck and Tylosaurus has a ridge on its back and no tail fluke. Furthermore, the extinction of non-bird dinosaurs isn't given an explanation, only depicted as a large earthquake and droughts, because the show was produced years before evidence of an asteroid impact came to light.
One of the more forward-thinking theories presented is the now-accepted fact that birds came from dinosaurs, though the animation falsely shows Archaeopteryx (long regarded as the "first bird") descending from generic thecodonts instead of dinosaurs (the term "thecodont" is not in use anymore, these days they would be called archosaurs).
The depictions of prehistoric animals and plants from the first episode were based on the paintings of acclaimed Czech artist Zdenek Burian, whose pictures were circulated the world over during the middle of the 20th century and influenced how many people thought of primordial life.
This is a French cartoon (dessin animé), conceptualized, written, illustrated and animated in France. The other countries listed paid for rights to dub and broadcast in their respective nations.