* ScheduleSlip: The genus list hasn't been updated since January 2012. The rest of the website was last updated in January 2015 with an apology for the three year delay and a promise to update the genus soon. There have been no updates to either since then.
* ScienceMarchesOn: Befalls the book itself, but the author, being a paleontologist, was savvy enough to set up the supplementary site to avert this. WordOfGod has said that an updated edition of the book itself may also be written eventually.
** The faceless, scaly ''Deinocheirus'' is a good example; in 2014, a complete skeleton of ''Deinocheirus'' was discovered, showing that it was a huge, goose-like animal fully covered in feathers with a bizarre, duck-like skull.
** This is also given a nod by the fact that several of Luis Rey's paintings in this book are updated versions of some of his older ones.
** Lampshaded frequently in the text as well. The author says this is part of what makes paleontology so fun and frustrating at the same time.
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