The main problem is often referred to as “shrink-wrapping”. I see they don’t mention another one, that theropods are so often shown with their wrists bending in the wrong direction.
I’ve noticed this is getting better though. Remember folks. Dinosaurs are clappers. Not slappers. They can hold the basketball. But not dribble it
Then how did the Raptors win the NBA Championship without dribbling the basketball?
Bad hair, incorrect feathering, and the skin flaps of a dinosaur is what I see in the bathroom mirror when I first get up in the morning.
(And it hardly qualifies as art.)
POSTSCRIPT: @Dan_Eastwood and @Michael_Callen, that’s another one for our old duffer gallery.
Be thankful you still can see it!!! Hahahah. 
Michael is a vampire??? Who knew!! 