In the prologue, The Koolasuchus' mouth slips off the Leaellynasaura corpse, but in the immediate following shot, it's firmly in his mouth.
After the Allosaurus had killed the Leaellynasaura and dropped it on the ground, the carcass is positioned in the opposite direction during the following shots.
When the female allosaur pulls out a slab of meat from the Muttaburrasaurus carcass, first it has an uneven chunk of meat sticking out of the left side of her jaw. In the next shot, the meat is a long, clean strip hanging from the right side of her jaw.
The egg-stealing mammal is actually a modern coati, which didn't exist 106 million years ago and also doesn't live anywhere near Antarctica.
Muttaburrasaurus is depicted as far too robust, looking like a standard iguanodont. This dinosaur belonged to a sub-group of iguanodonts called rhabdodontids, which were more slender.
The narrator claims the allosaur's kind were rare in the Early Cretaceous and only survive deep south, near the polar regions. But this is false, as a large group of allosaurs, the carcharodontosaurs were thriving at the time on other landmasses, like what later became Africa and South America. They were not driven to extinction, nor were they driven far south.
As the Leallynasaura is eating her own dead egg, its shell stick onto her beak. She shakes her head in a very unnatural-looking manner, making clear that she's just a hand-puppet.
When the young Leaellynasaura leaps away from the attacking Koolasuchus, the environment behind it can be seen through its mouth when the scene is freeze-framed.
In all shots of the animatronic Leaellynasaura, they have "excess skin" of sorts around their mouths, which juts out in an odd way when their mouths are closed. This is probably due to the material used to create the animatronics not being stretchy enough - it looks fine when the creatures open their mouths wide.
As the dwarf Allosaur kills its prey, it shakes its head violently from side to side. When it is done, it opens its mouth to drop the dead animal to the ground. Its jaws open, its head tilts to the side, but its neck remains still, so part of its head phases into the neck, creating a painful-looking effect.
As the lost Muttaburrasaurus pair moves about in the forest, watch their tails: near the end of the shot, they move very choppily, like a stop-motion animation. They move fluidly in all other shots.
When the Koolasuchus attacks the young Leaellynasaura, it doesn't even open its mouth, allowing the prey to freely hop away.
When the rival clan is shown, the bottom line of the screen is doubled for some odd reason. The same plants appear twice on top of each other.