* HeyItsThatVoice: The narrator is, of all people, [[Film/HarryPotter Gilderoy Lockhart]]
* WhatCouldHaveBeen:
** ''[[StockDinosaursTrueDinosaurs Baryonyx]]'' and ''Cetiosaurus'' were to appear in the main series, but they were replaced with ''[[StockDinosaursTrueDinosaurs Utahraptor]]'' and scrapped entirely, respectively.
** The ''Sea Monsters'' book describes a number of scenes that didn't make it into the series, such as the female [[UsefulNotes/PrehistoricLifeNonDinosaurianReptiles nothosaurs]] leaving their eggs on the beach at night (there is also a picture of Nigel inspecting those eggs, meaning it was filmed) and Nigel meeting the utterly bizarre [[http://en.wikipedia.org/wiki/Thalassocnus aquatic ground sloth]] ''[[UsefulNotes/PrehistoricLifeMammals Thalassocnus]]'' before going to look for the shark ''[[UsefulNotes/PrehistoricLifeOtherExtinctCreatures C. megalodon]]''.
** Originally ''Walking With Beasts'' was going to air first (the idea being that the trilogy would be moving backwards through time), but they only recieved enough money for a show about dinosaurs, and they made ''Walking With Dinosaurs''.