Ornitholestes is depicted as scaly, when it belonged to the coelurosaurian dinosaurs, which were fuzzy or feathered.
Ischigualastia lacked tusks in real life, but has giant tusks in this show. This is because it was originally meant to be a different animal, Placerias, and the CGI team couldn't redo the model when the animal's species got changed.
Throughout the series, there are shots when the animals unconvincingly slide across the terrain or float in the air when running, due to the rushed animation.