Oh yeah, I've seen that. At the beginning, there were some clips of some old Dinosaur Movies over the years. Among them was a Chasmosaurus from When Dinosaurs Ruled the Earth. Except there was no tribesman in front of it. But that's not the half of it. There was also a Tyrannosaurus Rex that was possibly Fighting the Chasmosaurus. Only I don't remember seeing the Tyrannosaurus Rex in When Dinosaurs Ruled the Earth. I say that Stop Motion Dinosaur Sequence is a Mystery. So far, the only Stop Motion Animators who did something like that in the day was Jim Danforth & Roger Dickins. I read it on a Dinosaur Filmography.