CGI effect sequences were done by Industrial Light & Magic or ILM, the same company that created the computer effects of the Jurassic Park and Jurassic World film series. According to paleontologist Bhart-Anjan Bhullar, a scientific consultant who worked with the ILM team, some of the animal models seen in the series could have been based on those seen in the Jurassic World films, albeit heavily updated to resemble real prehistoric animals rather than movie monsters. Bhullar suggested that ILM was aware that the Jurassic films had a mixed reputation among paleontology enthusiasts because the creatures seen in the films were not designed to be scientific (such as the oversized, scaly "raptors" that hark back to 1970s and 1980s depictions), so they tried to "get it right" with this series, and there was a lot of back and forth between the scientists and animators. Nevertheless, online paleo-communities have noted that some of the CGI animals presented in the series are still not up to 2020s scientific standards and feature odd mistakes like inaccurate skull shapes and body proportions. A few mistakes can be chalked up to science advancing while the series was being developed: the armored fish Dunkleosteus is shown with a long, slender body, though a 2023 study argued it would have been significantly shorter and more robust in life.
