As the Rhamphorhynchus are eating the horseshoe crab eggs on the shore, watch the one closest to the screen: the shadow of it's head is rendered wrong, and doesn't accurately mimic the movements the head makes. When the tip of its beak touches the ground, its shadow doesn't come closer.
The blue-screen effect of the Ophthalmosaurus pup has been rendered incorrectly, as evidenced by the strange blue spots that run along its body, through which you can actually see the objects in the background. This effect makes the animal seem transparent.
After the Eustreptospondylus has come ashore, the animal is pasted incorrectly into the shot. It walks behind some trees, but on the last tree, there is a very thin line where the dinosaur's body, which is in the background, overlaps part of the tree.
As the Rhamphorhynchus are looking for crab eggs in the sand, a strange triangular object that looks like a disembodied wing appears slightly to the left of the screen's center, and disappears into the sand.