In the U.S. version of this episode, the scene depicting two Australopithecus mating is almost completely blurred out. In the Australian version, it was cut.
Ancylotherium is a modified version of the Chalicotherium animation from the previous episode. The animatronic head is also the same, but with a new paint job.
The sound editors originally intended to use grunts and other noises produced by actual human actors for the Australopithecus sounds. The end effect was ridiculous, so they had to settle for wild ape noises.
Featured creatures: Australopithecus, Deinotherium, Dinofelis, Ancylotherium. This is the smallest cast of the series.
In the opening close-up of an Australopithecus's face, the creature is played by an actor with colored contact lenses and prosthetic make-up. In all other shots the creatures are either CGI or animatronics, just like all other creatures in the series.