The Great Book of Records is an enormous book that records everything that happens in Oz.
Scarecrow learns he was once Glinda's Chief Advisor. Unbeknownst to him, Scarecrow has served many key roles in the history of Oz.
Dorothy lands Glinda's Castle in Betsy Bobbin Central Park. Betsy Bobbin was a young woman from Oklahoma who went on magical adventures in Oz with her pet mule Hank. You can read more about her in L. Frank Baum's Tik-Tok of Oz.