Those who restore prehistoric life are limited by the evidence at hand, this is true, but “more conservative” does not mean “more accurate.”
Brian Switek, Dinosaur Tracking.
I suppose when I think of accuracy of prehistoric reconstructions, I think about representations of behaviour more than anatomy. The images in All Yesterdays that I've seen so far use what we know about modern vertebrate behaviour to illustrate possible ancient animal behaviour, instead of viewing these animals as static objects in an ancient environment, or for carnivorous non-avian dinosaurs in particular, as 'evil' eating machines.