In one shot there is no smoke coming from Amoukar's lantern, even though the previous and following shots show plenty of smoke billowing from the lantern.
There were no saber-toothed cats in Europe at any time. Saber-Toothed cats evolved in North America, then spread to South America during the Great American Interchange (when the Isthmus of Panama rose from the sea and connected North and South America). There *were* very large cave lions (Panthera Spelea) in Europe, but they had the regular dentition of modern African lions (Panthera Leo).
Given the geological setting and temporal range in which the film takes place, the ancient Pleistocene fauna of this specific point in prehistory should quite literally be everywhere in sight, inhabiting the vast barren landscape. In addition to such prehistoric beasts as wolves, big cats, vultures, mammoths and bears, there also would have been bison, antelope, giant deer, cave lions, woolly rhinos, cave hyenas, wild cattle and horses (to name but a few).
At around the 01:34 mark; a tribeswoman is seen eating a fairly large snake as she sits around the campfire at night listening to Amoukar telling the tale of his, Naoh, Ika and Gaw's adventurous journey with the rest of the Ulam. Being cold-blooded reptiles, snakes of such a proportion wouldn't have been capable of surviving through the extremely cold climate conditions of Palaeolithic Europe during its glacial ice age period.
The movie is set 80,000 years ago, and appears to show the one tribe has made pottery. Fragments of ancient pottery found in southern China date back to only 20,000 years, making them the world's oldest known pottery. However, the vessel shown is actually a dried hollow gourd.
In one shot the mastodons' faces are completely covered in hair, but in the next shot the hair is gone.
Ika is an unkempt, early human living 80,000 years ago yet she has no body hair.
In the first shot of the woolly mammoth opening its mouth, stubs of elephant tusks can be seen.
Wire attached to moth as it flies over the fire.
In one scene, when they are at the top of the mountain, in the background you can see a vehicle moving amidst the jungle from right to left side of the screen. You have to look very closely, it's very small and can barely be noticed. Sorry. i forgot to note the time but it's somewhere between 54:21 to 55:10.