Board Thread:Movie discussion/@comment-17754282-20150306201037/@comment-17754282-20150306223529

The trouble is that Hoplitosaurus belongs to the Polacanthinae branch of the armoured Dinosaurs and is believed to have looked much like Polacanthus and Gastonia, two species noted for having large spikes along their backs - they'd be much more noticable than those of Ankylosaurus (which shouldn't have much, if anything, in the way spikes anyway!)

But hey! This wouldn't be the first time the JP films got something wrong (cough) feathers (cough)