While on the "beach", they see and then chased by flying creatures that Theodore says are Pterodactyls and Archaeopteryx, that he says are the link between reptiles and birds. They're not. Actually, they're another form of pterosaurs, too big for Pterodactyls, are reptiles and completely different from Archaeopteryx which are winged dinosaurs who really are related to Modern Birds. And they wouldn't be flying together.
Theodore incorrectly said the trilobite fossil must be from the Silurian period, which only lasted about 30 million years. In fact, trilobites were around for approximately 300 million years, one of the most successful animal species ever.