* AccidentallyCorrectWriting: Perhaps one of the [[ExaggeratedTrope quickest examples]] of an [[ArtisticLicensePaleontology error]] getting validated by a future find. “Deep Sea Killers” depicted ''Brygmophyseter'' (the biting sperm whale) as being as big as megalodon (50 feet), even though the real animal was only 20-25 feet in length (about as big as an orca). Only three months after the episode aired, paleontologists in Peru found the skull of another big-toothed sperm whale that also shared the Miocene waters with megalodon and did grow as big as the giant shark, and two years later, it was named ''[[https://en.wikipedia.org/wiki/Livyatan Livyatan melvillei]]''. It's such an eerie coincidence that many people [[MandelaEffect mistakenly think]] the biting sperm whale was ''Livyatan''.
* DevelopmentHell: Where any further episodes of the AnimatedAdaptation have gone.
* FalselyAdvertisedAccuracy: There's plenty of it, but some of the most obvious examples are:
** As this came out in 2008, there is no justification for the dromaeosaurs looking as [[RaptorAttack retro as they do]]. WordOfGod is that this was due to budget cuts, but given that dromaeosaurs were essentially flightless birds (both phylogenetically and anatomically), making a documentary with them without the budget to animate feathers is akin to making a documentary about ice age mammals without having the budget to animate fur.
** It's claimed that ''Ceratosaurus'' was once the dominant predator of Jurassic North America, ruling for 20 million years, until ''Allosaurus'' evolved and drove it to extinction, then taking over as the new alpha predator for another 20 million years. Needless to say, no paleontologist ever made such a claim, as the two theropods are well known to have coexisted and died out together in the Late Jurassic, both lasting for around 5-6 million years.
** The orca-sized ''Brygmophyseter'' (known only from one specimen) is described as being 35-40 feet long, but in the fight with the megalodon, [[YourSizeMayVary it's shown to be the same size as the giant shark]] (50 feet). Though this wound up being AccidentallyCorrectWriting.
* FollowTheLeader: The premise is very similar to that of ''Series/AnimalFaceOff'', except it uses extinct animals. It's also similar to ''Series/TheTruthAboutKillerDinosaurs'' but with a heavier emphasis on violence.
* ScienceMarchesOn: While the show is a major offender of ArtisticLicensePaleontology, some of its inaccuracies fall into this trope.
** ''Nanotyrannus'' being treated as a distinct genus of small tyrannosaur. It was already controversial at the time, but after the series aired, countless studies have agreed that it's just a misidentified juvenile ''Tyrannosaurus rex''.
** ''[[UsefulNotes/PrehistoricLifeLargeTheropods Majungatholus]]'' is now called ''Majungasaurus''. The Madagascar abelisaur has a rather messy taxonomic history, as it was only known from very fragmentary remains for six decades (even originally being identified as a species of ''Megalosaurus'') until the discovery of a partial jawbone in the '50s, which led to it being renamed as ''Majungasaurus'', while the domed top of a skull was described as ''Majungatholus'' (thought to be a pachycephalosaur) in 1979. Then during the '90s, new material was uncovered at the site, including a well-preserved skull, which was assigned to ''Majungatholus'' in 1998 due to sporting the same dome-shaped top as the holotype, while the ''Majungasaurus'' dentary was dismissed as too fragmentary to be synonymized with ''Majungatholus''. However, far more extensive abelisaurid material was uncovered over the following decade, leading to the two genera becoming synonymized in a 2007 study (a year before the show aired), with ''Majungasaurus'' taking precedence. Some dubs use its proper name.
** Megalodon being depicted as a 50-foot great white instead of a stockier otodontid shark. Though the former notion was starting to wane at the time.
** ''Dromaeosaurus'' coexisting with T. rex and ''Edmontosaurus'' was based on isolated dromaeosaur teeth from Hell Creek and adjacent formations that were tentatively attributed to the Campanian taxon, but more complete fossil remains from Hell Creek later revealed that the biome housed different dromaeosaur taxa, the small ''Acheroraptor'' and the massive ''Dakotaraptor''.
** ''Utahraptor'' and ''Gastonia'' living in the Barremian instead of the earlier Valanginian age, along with the former being depicted as an oversized ''Deinonychus'' (down to being a simple PaletteSwap) instead of a stocky bruiser.
** ''Arctodus simus'', the giant short-faced bear, is depicted as a pure carnivore. This is a notion that was popular for a while, due to isotope analysis suggesting that it exclusively ate meat. However, this was determined based on specimens from Alaska, where vegetation that's edible to bears is rare ''today'' let alone during the Ice Age. Similar tests on individuals that lived further south showed that it ''did'' eat plants when they were available. Now it's seen as a grizzly bear-esque omnivore.
** The American lion, ''Panthera atrox'', is stated to be the largest cat ever to have lived, but later finds showed that several types of saber-toothed cats such as ''Smilodon populator'' and ''Machairodus horribilis'' rivaled it in size, or possibly even exceeded it (the largest S. ''populator'' specimen is estimated to have weighed a whooping 435 kg).
** As it aired in 2008, this show was the last serious depiction of a horned ''Pachyrhinosaurus''. While the idea that the boss of this ceratopsid supported a keratinous horn has always been a controversial one, it wasn't until a [[https://anatomypubs.onlinelibrary.wiley.com/doi/full/10.1002/ar.20985 2009 study]] showcased how dissimilar the skull of ''Pachyrhinosaurus'' is to that of a rhino that the idea died for good.
** ''Pachyrhinosaurus'' is depicted as a migratory species that annually traveled between Alaska and Alberta to escape the Arctic winter, a somewhat popular theory at the time but has since been dismissed after it was realized that the Alaskan ''Pachyrhinosaurus'' is a distinct and geologically younger species than the two species known from Alberta. In fact, ''Pachyrhinosaurus'' seems to have died out in the south and was replaced by other ceratopsids while having its last stronghold be the Arctic, while the Pipestone Creek find represents the oldest known species of ''Pachyrhinosaurus''.
** They claim that ''Albertosaurus'' ranged all throughout North America, from Alaska to Texas, but in reality, the genus is only known from Alberta and Montana (the same is true even if you include the older ''Gorgosaurus'' as a synonym). This reflects ''Albertosaurus''’s former status as a [[https://en.wikipedia.org/wiki/Wastebasket_taxon wastebasket taxon,]] with the Alaskan fossils later being described as ''Nanuqsaurus'' (a tyrannosaurine instead of an albertosaurine), while gracile tyrannosaurs from the Aguja Formation in Texas have likewise been reevaluated as a different, indeterminate type of tyrannosaur.
* WhatCouldHaveBeen:
** The host wanted to pit numerous other prehistoric beasts against each other, however the series wasn't renewed for a second season.
** [[https://twitter.com/Riamus01/status/1454840118515322880 Concept art shows]] both ''Charcarodontosaurus'' and ''Giganotosaurus'' were considered.
** George Blasing heavily pushed for a completely fictitious "''Tyrannosaurus'' vs ''Giganotosaurus''" episode. The network was against this idea because it wanted every episode to be based on actual fossil evidence, but was ready to give in after Blasing asked for months. Then it was suddenly cut at the last minute.
* WordOfGod: Dinosaur George answers questions about the show and palaeontology in general on his Website/YouTube channel. His videos are a lot more informative than the show, and George himself has a very friendly, down-to-earth attitude. Don't let his antics from the TV show fool you!