The program received some criticism due to Horner's negligence to take note of any evidence that might confirm the opposite of his theories.
The work provides examples of:
- Artistic License Paleontology:
- The program was well constructed and explained in detail why it presented the things the way it has, but paleontologists that happened not to hate Tyrannosaurus *Cough*Robert Bakker*Cough* may find it to be somewhat infuriating.
- That having been said, not all of Horner's facts make sense. Could an animal that size support itself by being lucky enough to constantly bump into still-edible dinosaur carcasses whenever it was hungry?
- False Dichotomy: Pure hunter or pure scavenger? Why can't T. rex be a bit of both?
- Feathered Fiend: Saurornitholestes and a bunch of other small dromaeosaurs which the rex chases away from their kill.
- Science Marches On: With more and more evidence arising to support the "predator" theory, even Horner himself admitted he was wrong about the animal.
- Stock Footage: From Discovery's former dinosaur show, When Dinosaurs Roamed America.
- The Makeover: Inverted. Horner takes a standard CGI Tyrannosaurus and turns it disgustingly ugly — or, in his mind, more realistic.
- The Worf Effect: A meta-example. What has previously been seen as the ultimate predator is actually a pathetic carrion stealer. At least, that was what the documentary set out to accomplish.
- Tyrannosaurus rex