Was originally to be narrated by David Attenborough, but he turned down the part, unwilling to support a fictitious, fake wildlife documentary. He would later open up to documentaries of prehistoric wildlife where animals are brought to life via special effects, lending his voice to productions such as Flying Monsters 3D with David Attenborough (2011), David Attenborough's Natural History Museum Alive (2014) and the series Planeta Pré-Histórico (2022), which many consider to be the successor to Caminhando com os Dinossauros (1999).
The program received much criticism for presenting theories as solid facts. One scientist infamously published an open letter that labeled the show's scientific consultants as "prostitutes" for "selling out" their knowledge to a television series. The creators argued that while they were making a documentary, their goal was also to entertain, and since the hypotheses about prehistoric creatures always change, they couldn't possibly have made a TV show that accurately depicts the world of the dinosaurs. In particular, scientific advisor David Martill pushed the creators to include speculation and sensationalism even if it was based on dubious hypotheses, reasoning that the history of paleontology is littered with errors anyway. And he was right - many theories presented in the show have by now been declared outdated and incorrect. Several of the series' prehistoric animals now have different names, some like the Liopleurodon and Ornithocheirus were a lot smaller and dromaeosaurs (AKA "raptors") are now known to have had feathers. Only a couple animal depictions in the show still hold up to scrutiny.
For dinosaur drool, the filming crew used huge quantities of KY jelly. Reportedly, many shop owners gave them puzzled faces when they bought it.
The scene with the Stegosaurus was filmed in Fern Canyon in California's Prairie Creek Redwoods State Park. Some years earlier, this same location was used to film the Stegosaurus scene for the movie O Mundo Perdido: Jurassic Park (1997).
Liopleurodon, the giant carnivorous marine reptile from the third episode, is thought to have become popular thanks to this series, and its distinctive color-scheme of black and white has been reused in many other places, including popular book illustrations and toys.