YMMV: All Yesterdays
- Awesome Art: Every single illustration in both books. They really sell you on the fact that dinosaurs and their Mesozoic neighbors were animals and not monsters. Special mention goes to the camouflaged plesiosaur, the spiky Triceratops and the beautifully birdlike Microraptor family.
- Genius Bonus: The artwork contains a lot of paleoart references that aren't explicitly stated in the text. The scaly, shrink-wrapped face of the cat, for example, is a Take That to feathered dinosaurs commonly being portrayed with scaly heads, despite there being hardly any evidence to support this.
- It's Short, so It Sucks : While the book is generally well received, the main complaint even from people who liked it is that's a lot shorter and has less content than they expected.
- Nightmare Fuel: Several instances, including the Stegosaurus trying to rape an unfortunate sauropod (yes, you read that correctly), the pterosaur-eating centipede and practically every installment of "All Todays" (especially the spider monkey).
- Sequelitis: All Your Yesterdays was significantly less well received than the original. This may have something to do with a large portion being contributions from non-experts.
- Despite this, two of its speculations (that some anomalocaridids fed like modern baleen whales and scansoriopterygids gliding like flying squirrels) were actually confirmed by subsequent fossil discoveries.
- Squick: Homo diluvii, seen in bottom left picture in this compilation of pictures◊ from All Yesterdays. It is humanoid in a rather disturbing way.
- The giant penises of the Citipati and Stegosaurus.