That Is All is the third and final part of a trilogy of "COMPLETE WORLD KNOWLEDGE".[1] The trilogy is a collective whole, featuring continuous page numbering – that is, the last page of The Areas of My Expertise is page 236,[2] and the first page of More Information Than You Require is page 237.[3] "That Is All" starts at page 607.[4]
One of the book's topics is preparation for the upcoming end of the world. Each page includes a fictionalized calendar of events leading to the end of the world on December 21, 2012. Hodgman refers to this time as Ragnarök.[5] The book's other topics include sports,[6] wine, and a list of seven hundred ancient and unspeakable gods.[7]