The CGI version of the Microraptor has its primary feathers incorrectly attach to the wrist, a very amateurish mistake. However when the physical Microraptor puppet is shown, it correctly has its primaries growing out of its middle finger.
The dinosaurs Troodon and Mei are depicted as scaly, even though by the time this show was made, evidence had come to light that they were probably covered in feathers.
Even though the characters have a time machine, the need to act quickly to save prehistoric animals is brought up in several episodes. In one episode, it's even a plot point that they arrived too late to save some saber-toothed cat cubs, which makes no sense.