The props used for the closeups of the Australopithecus have a flatter face than the CGI ones, and their skin is also more glossy and darker.
The number of vultures around the zebra carcass changes between shots as Hercules drives them off.
When the group are grooming, Grey puts his elbow on his knee, but in the next shot, his arm is beside him.
As the group eat the zebra carcass, in the final shot of the scene all of the apes lack their hair and are completely bare. The animators probably "switched off" their fur when rendering this shot to save up on time and money, without realizing that the creatures were close enough to the camera to make this cost-cutting trick noticeable.
The trunk of the Deinotherium is far too short. This animal had very long legs that made it taller than modern elephants, so it would have needed a longer trunk to be able to drink.
As the Dinofelis cat rests on a tree, yawning in the sunset, notice how one of its hind feet passes through the branch.
Sometimes when the Australopithecus bend over, their genitalia pass through their thighs and appear to jut out from their hind quarters.
When Grey steals the egg from Blackeye, as she bends over to yell at him, her breasts don't hang down but press against her chest, almost disappearing into her body.
When the Deinotherium turns to go after Babble's baby, it doesn't cast a shadow on the ground.
In the final shot of the program, when the Australopithecus are grooming, their shadows don't match the color of the other shadows on the ground, nor do they cast shadows on each other.
When the Deinotherium chargers Babble, it keeps roaring without opening its mouth.