- Hey, It's That Guy!: So, Ricky Walsh survived and became a high-ranking general.
- Science Marches On: While reasonably accurate for its day, Carnosaur is still over 30 years old, so....
- Deinonychus is portrayed as featherless, using its claws like scythes. We now know that deinonychosaurs had feathers and used their toe claws as hooks.
- It is now known that plesiosaurs do not hatch from eggs and cannot lift their necks above water.
- It used to be thought that some theropods could be at least partially quadrupedal, and the Atispinax (now named Becklespinax) is portrayed as such in the novel. This is now seen as anatomically impossible.
- Back when the novel was written, several of the featured dinosaurs (namely Tyrannosaurus, Tarbosaurus, Megalosaurus, and Altispinax) would have been considered carnosaurs, as it was thought at the time that all large theropods were fairly closely related. Carnosauria has recently been redefined as Allosaurus and its close relatives, leaving Altispinax as the only actual carnosaur in the book.
- Inversion: At the time the novel was written, Scolosaurus was thought to be a synonym for Euolocephalus. Later in 2013, Scolosaurus turned out to be its own valid genus after all.