Most of the theropods in the series have pronated (facing towards the body) hands, when because of the shape of their arm bones, would have been usually been facing each other, as though they were about to clap.
The Velociraptors lack feathers in favour of scaly skin like lizards. Most scientific evidence points to them having complex feathers.
During the title sequence, a pterosaur flies past above a Saurolophus, but it doesn't cast a shadow on it. Also, the shadow of the Tarbosaurus' feet don't match up, its left foot seems to be slightly floating.