''Paleoworld'' (1994-1997) is one of the most complete documentaries on prehistoric life that ever aired. However, given its air date, it has become majorly dated.
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!!!! '''Examples for each episode''':
!!! Episode 1: Rise of the Predators
* ''Eoraptor''’s status as a basal predatory theropod, and even its exact position within Dinosauria, has been subject to debate for decades now. The problem lies in the fact that it shares so many traits found in other groups of basal dinosaurs, that it’s been difficult to determine exactly which group ''Eoraptor'' really belongs to. Current research points to it being, of all things, a ''basal sauropodomorph''. [[note]] The same group of dinosaurs the more famous ''Plateosaurus'' belongs to. [[/note]]
** Even more uniquely, while it’s still considered to be a predator, ''Eoraptor'' was omnivorous.
!!! Episode 2: Flight of the Pterosaurs
* Throughout the episode, paleontologists argue whether pterosaurs walked on two or four legs. Current consensus favors the latter theory.
* One scientist asserts that pterosaurs would be rather slow on the ground. Current science suggests that this isn't the case at all. Indeed, ''Quetzalcoatlus'' would have been a LightningBruiser on the ground.
!!! Episode 3: Back to the Seas
* Whales are no longer believed to have descended from mesonychids, but rather from artiodactyl (even-toed) ungulates, such as pigs, cattle, deer, antelope, camels and hippopotami.
* ''Pakicetus'' was more doglike than the episode portrayed it.
!!! Episode 4: Carnosaurs
* Most of these guys aren't even carnosaurs in the 21st century, and it's now understood that multiple lineages of theropods that reached large sizes simply converged on similar superficial similarities such as oversized heads and small arms but were otherwise quite distinct. These days, the term refers only to ''Allosaurus'' and its closest kin (although the episode does acknowledge that it's something of an informal term). For context, ''Cryolophosaurus'' is thought to be a basal neotheropod (possibly a very basal tetanuran), ''Carnotaurus'' is a ceratosaur, and tyrannosaurs like T. rex and ''Albertosaurus'' are giant coelurosaurs (closer to dromaeosaurs than allosaurs). Interestingly the first studies to seriously push the idea of tyrannosaurs being coelurosaurs using modern cladistics came out around the same time this episode aired.
* ''Carnotaurus'' wasn't a primitive "carnosaur" from the Early Cretaceous, but rather one of the last and most derived of the abelisaurs, having lived just before T. rex. It was also far from the biggest South American theropod, as the local carcharodontosaurs such as ''Giganotosaurus'' (named just one year after this episode aired) grew just as massive as the biggest tyrannosaurs, and ''Carnotaurus'' itself would have been sympatric with the even large megaraptoran ''Maip'' (named in 2022).
* The "prosauropod" that coexisted with ''Cryolophosaurus'' was named ''Glacialisaurus'' in 2007.
* It's mentioned that during the Late Cretaceous, "carnosaurs" (meaning tyrannosaurids) were evolving and diversifying much more rapidly than in the past. This is purely because in the early '90s, we still had relatively few large predators known from older strata (Jurassic to Mid Cretaceous) but countless new taxa described since then show that predatory dinosaurs had always been diverse and evolving quickly, such as numerous forms of carcharodontosaurids from the Early-Mid Cretaceous, who also had a near-cosmopolitan distribution (unlike tyrannosaurids, who only inhabited Asia and North America).
* When comparing T. rex and ''Albertosaurus'', it's claimed that the two represent opposite extremes, with ''Albertosaurus'' having evolved to be more gracile and better suited for running. Now that we know a lot more about tyrannosaur evolution and the ontogeny of derived tyrannosaurids, it's known that tyrannosaurs spent most of the Mesozoic as small, gracile, and long-legged mesocarnivores, and that juvenile tyrannosaurids retained that body plan before growing into bulky, slower-moving bruisers (as is well-documented in T. rex itself), while albertosaurines retained their more gracile build into adulthood (an example of neotony).
* When talking about "carnosaur" integument, they bring up the possibility of them having lizard-like scale or even feathers before showing the skin impressions of ''Carnotaurus'' (which is scaly and covered in bumpy osteoderms) as an example of what their integument would have looked like. However, since many of the other "carnosaurs" aren't closely related to ''Carnotaurus'' (an abelisaurid ceratosaur distinct from tetanurans), this doesn't apply to them, and many large tetanurans such as ''Allosaurus'' and tyrannosaurids instead show evidence of being covered in small, non-overlapping scales, and basal tyrannosaurs such as ''Dilong'' and the large-sized ''Yutyrannus'' preserve evidence of being covered in primitive hair-like feathers (unsurprising, given that they were basal coelurosaurs), though later forms like T. rex seem to have reverted back to being mostly (or even entirely) scaly since they lived in warmer climes and didn't need insulation (on top of benefitting from gigantothermy).
!!! Episode 5: Missing Links
!!! Episode 6: Sea Monsters
* ''Kronosaurus'' did not grow 50 feet long. The first specimens found were in poor condition, and so the people who put the fossil together gave it too many vertebrae. It probably didn't reach much longer than 33 feet.
* Plesiosaurs probably couldn't return to land, as their anatomy had become far too specialized for life in the sea and the large elasmosaurids and pliosaurids would have been too heavy to leave the water without becoming beached. On top of that, a specimen of ''Polycotylus'' was later found to have died while giving birth to live young, showing that plesiosaurs were viviparous just like ichthyosaurs, which lines up with their lack of adaptations for terrestrial movement.
* "''Mosasaurus maximus''" has been sunk into ''Mosasaurus hoffmanni''. And mosasaurs would have had vertical tail-flukes and more compact bodies, which would have made them much more effective swimmers.
!!! Episode 7: Tale of a Sail
!!! Episode 8: Attack of the Killer Kangaroos
!!! Episode 9: Dino Sex
!!! Episode 10: Mistaken Identity
!!! Episode 11: The Legendary ''T-Rex''
* Most of the episode is dedicated to discussing whether ''Tyrannosaurus Rex'' was an obligate scavenger or opportunistic predator. Since the episode aired, at least two Edmontosaurus specimens and a Triceratops were recovered showing bite marks matching the dentition of T-Rex that showed new bone growth around the wound, indicating that they survived attacks from the giant theropod. As such, Tyrannosaurus is now near universally thought to be an opportunistic predator, much like modern day mammalian and avian predators.
* Most of ''Sue'''s injuries are now believed to be the result of parasitic infections and trampling by other dinosaurs after she died.
* The episode does go into some detail about sexual dimorphism in ''Tyrannosaurus Rex'', citing the larger specimens, and those without full chevron bones, as being female. However, ''Sue'' herself was later found to have a chevron in her first tail vertebra, and it is thought that the differences between specimens is a result of age and geographic variation, thus weakening the evidence of sexual dimorphism in the giant theropod.
!!! Episode 12: Dino Docs
!!! Episode 13: The Mysteries of Extinction
!!! Episode 14: African Graveyard I: Hunting Dinosaurs
* ''Spinosaurus'' wasn't just a generic theropod with a sail. It was a highly specialized piscivore with a crocodile-like skull (confirmed just after this episode aired), that was also amphibious with short back legs (confirmed with new finds in 2014) and even had a paddle-like tail akin to a crocodile (confirmed with finds in 2020), making it one of the strangest and most derived theropods.
!!! Episode 15: African Graveyard II: Discovering Dinos
!!! Episode 16: Earthshakers
* ''Seismosaurus'' was not its own species, but rather a large ''Diplodocus''.
!!! Episode 17: Trail of the Neanderthal
!!! Episode 18: Monsters on the Move
!!! Episode 19: Mystery of Dinosaur Cove
* ''Leaellynasaura'' and the other Dinosaur Cove ornithopods are called "hypsilophodonts", which has since been recognized as a wastebasket group of unrelated little ornithischians, and the ones from Dinosaur Cove are thought to be elasmarians, a widely distributed group of southern ornithopods also known from Argentina and Antarctica.
* ''Timmimus'' is no longer considered an ornithomimosaur and is seen as too fragmentary to be positively identified as anything beyond an indeterminate coelurosaur. Likewise, the also very fragmentary and dubious ''Serendipaceratops'' (named in 2003) probably isn't a ceratopsian and might instead be an ankylosaur (akin to ''Minmi'' and ''Kunbarrasaurus''). This jettisons the notion that either ceratopsians or ostrich dinos have their origins in Australia.
* There was no dwarf polar ''Allosaurus'' living in Early Cretaceous southern Australia. This was based on a single ankle bone, now thought to belong to a megaraptoran similar to the Queensland ''Australovenator''.
* The late-surviving Victorian "labyrinthodont" was named ''Koolasuchus'' in 1997.
!!! Episode 20: Dinos in the Air
* ''Protoavis'' is probably just a jumble of bones from different creatures, not an early bird. As a matter of fact, the coelurosaurs (the very diverse group of theropods that includes birds) likely didn't diverge from other tetanuran theropods until well into the Lower Jurassic.
!!! Episode 21: Mammoths!
!!! Episode 22: Are Rhinos Dinos?
!!! Episode 23: Killer Birds
* Terror birds did not have clawed wings, this was a mistaken assumption based on a unique wing bone found in ''Titanis'', which later turned out to also be present in seriema (their closest relatives), who lack such features. Evolving clawed wings would be a pretty useless adaption when they already had powerful beaks and sharp talons for killing and feeding.
!!! Episode 24: The Land That Time Forgot
!!! Episode 25: Island of the Giant Rats
!!! Episode 26: ''Troodon'': Dinosaur Genius
* ''Troodon'' is no longer considered to be a valid genus.
* ''Troodontids'' should have feathers.
!!! Episode 27: Ancient Crocodiles
!!! Episode 28: Dawn of the Cats
!!! Episode 29: Boneheads
!!! Episode 30: Amber Hunters
!!! Episode 31: Dinos in the Snow
* ''Edmontosaurus'' is stated to have no crest on top of it's head. But since then a specimen of the species ''Edmontosaurus'' Regalis has been discovered with a crest.
!!! Episode 32: Armored Dinos
!!! Episode 33: Flesh on the Bone
!!! Episode 34: Ape Man
!!! Episode 35: Horns and Herds
!!! Episode 36: Treasure Island
!!! Episode 37: Dino Diet
!!! Episode 38: Dwarf Dinos
* Despite the episode being about Hateg island, there is no mention of its apex predator, the giant stocky azhdarchid ''Hatzegopteryx'', who wasn't named until 2002. This biome wasn't merely a dinosaur lilliput, but also a land dominated by gigantic pterosaurs, the only known ecosystem from the Mesozoic where the latter ruled the roost.
!!! Episode 39: Early Birds
!!! Episode 40: Prehistoric Sharks
!!! Episode 41: Loch Ness Secrets
* Mosasaurs could not move on land, nor were they ancestral to monitor lizards.
!!! Episode 42: Secrets of the ''Brontosaurus''
!!! Episode 43: Baby Monsters
!!! Episode 44: Valley of Venom
!!! Episode 45: Dawn of the Dinosaurs
!!! Episode 46: Killer Raptors
* ''Deinonychus'' should be feathered, and its skull would be more elongated.
* ''Megaraptor'' was not a dromaeosaur, but rather a wholly different type of theropod with an abnormally large hand claw, eventually becoming the type genus of its own family, the megaraptorans.
!!! Episode 47: Clash of the Titans
* ''Giganotosaurus'' was not the largest carnivorous dinosaur, and it's unlikely that there an actual record-holder. Giant carcharodontosaurs like it, along with giant tyrannosaurs like T. rex likely represented the max size limit for macropredatory theropods, and 40-43-foot giants existed all throughout the Mesozoic. Spinosaurs reached similar dimensions, with ''Spinosaurus'' possibly being the longest (at 50 feet) but it was a specialized amphibious piscivore.
!!! Episode 48: Dinosaur Doomsday
!!! Episode 49: Valley of the Uglies
* ''Diatryma'' should be called ''Gastornis'', and isotope analyses proved that it was actually a herbivore, more like a giant cassowary than a prototype terror bird.
* Entelodonts are no longer considered cousins of pigs but rather of whales and hippos.
!!! Episode 50: ''Troodon'': Portrait of a Killer
* ''Troodon'' should be feathered.