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Nigel claims that Mosasaurs are related to snakes, hence their shape. This is technically correct, though only distantly so. According to paleonologists, mosasaurs are closely related to monitor lizards, a family of reptiles that includes the Komodo Dragon.
Nigel claims that Ornithocheirus was the largest pterosaur to ever fly the skies. At the time Nigel visits, it was, but the record is thought to be held by another pterosaur, Quetzalcoatlus.
Some of the dinosaurs in Ballad of Big Al sound different than their counterparts in Time of the Titans. Most noticable are the carnivores. Allosaurus gets new vocalizations, while the Ornitholestes sound like the Dromeaosaurs in Death of a Dynasty. In addition, the head of the Allosaurs has recieved a makeover, most noticable in their eye crests.
In the original UK version, the narrator identifies the meteorite responsible for the destruction of the dinosaurs as a "comet". This is incorrect; most scientists believe the responsible agent was an asteroid, a large celestial body made up of mostly metals. Comets are giant "dirty snowballs" and would have likely exploded before impacting the earth, as what is thought to have happened in 1908 with the Tunguska explosion.
Utahraptor is depicted roaming the plains of ancient Europe. In reality, Utahraptor lived in present day-Utah. There is no evidence Utahraptor made it to Europe; in fact, the palentological evidence shows that during the early Cretaceous, North America was split by a shallow sea, which made it nearly impossible for Utahraptor to migrate to Europe.
In the original opening narration, during the scene with the Diplodocus, the narrator says that reptiles are the most dominant species. In retrospect, this is probably not true. Recent paleonotological evidence suggests that dinosaurs may have been a intermediary group between reptiles and birds. In fact, dinosaurs may belong to a seperate group of animals all together.
The narrator in the original UK version states that Diplodocus had a mass around 30 metric tons (about 33 US tons). That's not true; the actual estimated mass of Diplodocus was closer to 20 metric tons (about 22 US tons). Still big enough to knock over a tree.
Nitpick: This episode is really misnamed. Recent finds in South America suggest that the Cretaceous, not the Jurassic, was the true time of the titans. Of course, at the time this series was in production, those finds were just becoming public.
In the US verison, during the scene where water is running into the dried channel, the narrator is heard saying that the resulting flood will drown thousands of animals - despite the fact that that amount of water we see isn't enough to do any such thing. This line is appropriatly missing from the original UK version.