User blog comment:Dinosaurus1/Let's talk about Clash of the Dinosaurs/@comment-2118191-20171126195122

"Sauroposeidon is shown to have a small brain, although no skull has ever been found in real life."

That's not an inaccuracy. It doesn't matter if the skull hasn't been found, by default it'd have to have a small skull for its body size, and thus a small brain.