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Jump to: Anachronisms (1) | Continuity (1) | Factual errors (2) | Miscellaneous (2) | Revealing mistakes (18) | Spoilers (2)

Anachronisms 

Edaphosaurus had already gone extinct by the time Dimetrodon evolved, thus the latter couldn't have hunted the former.
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Continuity 

The placement of the shadows changes in separate shots when the male Dimetrodons arrive to steal the female's kill.
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Factual errors 

The Mesothelae spider injects black venom into its victim, however spiders are known to have clear venom.
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Petrolacosaurus couldn't have evolved into Edaphosaurus, since it was a diapsid, a reptile that belonged to a completely different animal lineage than Edaphosaurus (a synapsid).
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Miscellaneous 

As one of the Edaphosaurus is shown laying down, there is a large rock under its tail. The shadow the animal's tail casts on the rock has the same color as the shadow on the ground, yet the rock itself has a much darker shade, meaning the shadow upon it should be darker as well.
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As the female Dimetrodon starts eating the Edaphosaurus carcass, she leans ever so slightly backwards. Then she lowers her head again, but this motion follows the exact same pattern as the backwards-leaning motion - the animation is simply reversed, creating a slightly odd effect. The other parts of the animal, like her tail, continue in their motion, so only the animation used for the head has been reversed.
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Revealing mistakes 

As the two female Dimetrodon clash, you can see very briefly that the head of one of them passes halfway into the side of the other.
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When the female Mesothelae spider lunges after the Petrolacosaurus, there is an upward-jutting object ahead of her, and the shadow she casts on it is flattened, as if being cast on regular ground.
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When the Dimetrodon appears, you can still see the Sun's rays shining even after it has blotted out the Sun itself with its large back-sail. Normally, when the light-emitting object is covered, its rays also "disappear".
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The Arthropleura keeps making clicking sounds with its pincers, even though they never actually come into contact.
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One shot shows a pair of Edaphosaurus youngsters playing. They are in the shadow of a tree, yet the tree only casts shadows on the ground, not onto their bodies.
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When the amphibians are jumping out of the pond to catch the Meganeura dragonflies, in one shot they aren't reflected in the water. Also, in the closeup shot of a single amphibian jumping, there are actually two separate splash effects layered on top of one another, creating a very bizarre looking splash.
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The second dust cloud that the antagonistic female Dimetrodon kicks up during digging appears a split second before she moves her leg.
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When the Meganeura swoops down to steal the spider's meal, its shadow makes it look like it doesn't come down to the ground.
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When the amphibian jumps onto the Arthropleura, the plates on its back visibly clip into the amphibian's belly.
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As the three Dimetrodons are eating the Edaphosaurus, the carcass moves about back and forth, even though none of the Dimetrodons are moving it.
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During the long panning shot over the Edaphosaurus herd, the animals are incorrectly composited into the shot and keep sliding sideways. This is best noticeable on the specimen on the left of the screen in the beginning of the shot, standing behind the bellowing Edaphosaurus. This shot is also shown in the series' introduction but without the Edaphosaurus standing in the front, so the error can be seen better there.
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In one of the tracking shots during the Dimetrodon's hunting scene, there is a small Edaphosaurus on the left of the screen that's meant to be farther away, yet it overlaps another Edaphosaurus that's closer. Later in the same shot, another Edaphosaurus runs to the left in the same area, and again a smaller one that's supposed to be behind it overlaps it.
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A couple of shots before the narrator says "She locks onto her victim.", there's a compositing error on the left edge of the screen. Some dust is in the air, but it is cleanly cut off near the screen's edge with a straight vertical line.
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When the small Edaphosaurus runs behind some fallen tree branches, and then when the Dimetrodon kills it, both times the animals are placed incorrectly into the shot. There is a faint outline around the branches where you can see the rocky background through the animals themselves.
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When the female Dimetrodon is eating from the Edaphosaurus carcass, the latter keeps moving even when she's not touching it.
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None of the Dimetrodon cast shadows on the Edaphosaurus carcass.
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When the male Dimetrodon swallows the Edaphosaurus' leg, it doesn't go into its mouth, but disappears behind its head.
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There are multiple compositing issues when the male Dimetrodon eat the Edaphosaurus:
  • The Edaphosaurus' tail goes behind the back foot of the Dimetrodon standing to the right, even though the placement of its foot suggests that it's farther away. The way the area around its foot is cropped makes it look like the tail passes into the ground several times.
  • The Edaphosaurus' leg was removed digitally in a rather sloppy manner. Instead of ending in a clean cut, the tip of the stub is faded and appears transparent.
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Spoilers

The goof items below may give away important plot points.

Plot holes 

Lightning usually strikes the tallest objects. So it makes no sense for a lightning bolt to hit the spider's burrow which is underground, surrounded by a forest with enormous trees.
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Revealing mistakes 

When the Petrolacosaurus eats the burned spider, it casts a shadow on its leg, but it doesn't correspond with its shape, rather it seems to be layered on top as if it was a flat surface.
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See also

Trivia | Crazy Credits | Quotes | Alternate Versions | Connections | Soundtracks

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