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- Walking With Dinosaurs:
- What was thought to be evidence for "cannibalistic Coelophysis" has been discredited.
- The early long-necked dinosaur Plateosaurus could not walk on four legs.
- The pillar-limbed croc-relative Postosuchus was most likely a biped, or at least semi-bipedal, rather than an obligate quadruped.
- Placerias and the Cynodont aren't reptiles in modern phylogenetic sense, but instead mammal ancestors.
- There were no Cynodonts of the size depicted in the program in the late Triassic. This is an example of Science Marches On rather than Somewhere a Palaeontologist Is Crying because at the time the series was produced it was assumed that cynodonts of that size did live in Late Triassic in North America. This assumption was based on the discovery of two teeth from Chinle Formation. However, post-WWD study indicate that these teeth can't be confidently referred to Cynodontia (or any other known group of Triassic amniotes, for that matter).
- Sorry, Ornitholestes, you didn't actually have that horn-thing on your nose.
- Post-WWD studies indicate that sauropod dinosaurs probably didn't grow to adult size within more or less ten years as shown in the series, although exactly how fast they grew is still debated (current estimates range from less than four decades to up to 70 years of growth necessary to reach adult size).
- And speaking of sauropods, the idea that they could only hold their necks horizontally - which influenced the WWD reconstructions of Diplodocus, Apatosaurus and Argentinosaurus, which in turn probably popularized the concept - is questioned nowadays as well.
- Not to mention the "iguana-spike-backed Diplodocus: some researchers now argue these spike were spread across on Diplodocus' back rather than put in a single line as shown in the program.
- Another amazing example: footprints from a baby bipedal sauropod have been recently found: perhaps Littlefoot and the WWD sauropodlets walked on two legs and become quadrupedal only when they grew larger! (an ancient heritage from their ancestors, the "prosauropods" such as the aforementioned Plateosaurus). However, most paleontologists are skeptical of this interpretation. Even the trackways of adult sauropods often leave just the prints from just one pair of feet, thus is even more likely about the younger ones.
- About sea reptiles: the long-necked plesiosaurs gave birth to alive newborns just like the fish-like ichthyosaurs; and they perhaps cannot crawl onto land because the shape of their chest.
- Most coelurosaurs certainly had feathers. The several dromaeosaurid species surely had them, but in the series they are all shown featherless (except obviously Microraptor, see further): this, rather than Science Marches On, might be interpreted more as Rule of Cool, or rather, Somewhere a Palaeontologist Is Crying, since feathered raptors would have appeared "too cute"?. In Real Life dromeosaurids had WING-shaped forelimbs just like their famous relative, the "ur-bird" Archaeopteryx...
- This might be nothing compared to what is seeming to come: most small-sized dinosaurs had probably some sort of covering. This is a very recent theory led by the discover of the primitive herbivore Tianyulong in China: the theory is that some kind of covering was present in the last common ancestor of all dinosaurs and pterosaurs, and then it was partially lost by its largest descendents because of the Surface area to volume ratio. Some think the "spikes" on Diplodocus have the same common origin of feathers, as well as the quill of the small herbivore Psittacosaurus and even the horny bumps lined on the back of several hadrosaur mummies. See Dinosaurs for more infos about that. Whatever the case, the old "gigantic lizards" seem to have their days numbered now.
- An example of taxonomy marching on: "the American Iguanodon" from the fourth episode would probably be placed in the genus Dakotadon today.
- Honestly, it's doubtful the European Iguanodon was actually Iguanodon and not, for example, Mantellisaurus or Barilium.
- Leaellynasaura should have a much, much longer tail. Also, some argue it needs a plumage.
- Female Tyrannosaurus probably weren't larger than males.
- Also the giant pterosaur Quetzalcoatlus is shown as a fish eater hunting prey on the wing, while we now know it was actually stork like in habits. In fact, it probably wouldn't have hesitated to eat juvenile tyrannosaurs, like the ones in the program!
- It looks like another example may be approaching. It's recently been theorized that Triceratops and Torosaurus (which were featured in Death of a Dynasty as seperate genera) are actually the same animal in different growth stages.
- The accompanying book briefly mentions the possibility that Anatotitan is synonymous with Edmontosaurus. As of September 2011, this is the majority view.
- They did try to partially remedy all the issues by showing Walking with Dinosaurs again in 2008 with updated narration. Unfortunately, the visuals remained untouched, so the small carnivore Ornitholestes still had a horn, coelurosaurs were still scaly, so on and so forth.
- Walking With Beasts:
- This series has Andrewsarchus, known only from the skull and a few fragments of bone. At the time the series was produced it was assumed to be closely related to mesonychids, and thus in the series it was modeled after mesonychids. However, later phylogenetic studies indicate that it might have actually been a close relative of entelodonts.
- A tamandua briefly appears in the first episode of this series, likely supposed to represent Eurotamandua from the Eocene of Messel, which was initially identified as an anteater. However, more recent studies indicate that it probably wasn't an anteater and quite likely it wasn't a xenarthran at all.
- Walking With Monsters:
- It seems that early Devonian "amphibians" cannot crawl onto land with their limbs, see Prehistoric Life.
- The Giant Spider in the Carboniferous was based on Megarachne, which ultimately turned out to be eurypterid ("sea scorpion") rather than spider.
- The lineage that gave rise to mammals split to the one that gave rise to reptiles and birds before those invented the reptilian scales. The show represents perhaps the first time that Dimetrodon and its herbivorous "twin" Edaphosaurus have skins similar that of modern hairless mammals, instead of the classic scaly one. However, some think now that they would have the skin texture of a salamander, and the belly of a fish.
- The armoured plant-eating near-reptile Scutosaurus wasn't probably the ancestor of turtles. Recent research suggests that the latter were closer to modern reptiles than to Scutosaurus.
- Chased by Dinosaurs:
- The special Land of Giants portrayed the largest land animal of all time, Argentinosaurus, being hunted by the largest land predator, Giganotosaurus. At least one, and possibly both have since been supplanted; not long after, new evidence found that, in fact, Spinosaurus was the biggest land predator, and, although the findings are sketchy at best, Bruhathkayosaurus may be the largest land animal of all time. At the time of the show's airing, however, they were thought to be record holders.
- Sea Monsters:
- The enormously long-necked Tanystropheus was potrayed as capable of losing and regenerating its tail like a lizard. In the past it was indeed suggested by palaeontologist Rupert Wild that this creature was capable of autotomy, but other scientists who studied its fossils didn't find evidence for that. It has also been portrayed as an accomplished swimmer, but we don't know for sure if it really was such - its body-shape was all but hydrodynamic, and some think Tanystropheus was a shore animal who used its neck as a fishing rod, catching small prey a bit like a heron.
- In the accompanying book there is a scene when female nothosaurs (primitive Triassic sea reptiles related with the more famous plesiosaurs) leave their eggs on the beach at night (see What Could Have Been on the Trivia page). However it turns out that nothosaurs might have been viviparous.
- The Complete Guide to Prehistoric Life:
- Othnielia and Leaellynasaura do not appear to be ornithopods, but more primitive ornithischians.
- Page 122 claims that therizinosaurs are known from "a lone species" from North America, probably referring to Nothronychus. Enter the ancestral therizinosaur Falcarius in 2005...
- To quote page 125, "Scientist cannot agree on whether Mononykus was a bird or a [non-bird] dinosaur." The 2010 discovery of the ancestral alvarezsaur Haplocheirus confirms that Mononykus and other alvarezsaurs were not birds.
- though these teeth were assumed to belong to traversodont cynodonts, much different from Thrinaxodon that WWD-cynodonts were based on
- who also thought that Tanystropheus was closely related to lizards - nowadays it's generally considered to be more closely related to archosaurs than to lizards
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