Thanks LeToastyMaple for the fourth fact and neonstar3 for the last fact!
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-If Tigerstar would've gotten The Three on his side during the Great Battle, he would've taken over the Clans.

-It takes about 6 months to plan, pre-draft, write, edit, and publish a series book.

-Hawkfrost first tried to get Dovewing to train with him in the Dark Forest, but she simply scratched his face and escaped.

-In The Ultimate Guide on Cinderheart's page, it says that "Cinderheart became a warrior apprentice alongside her brothers..." when she actually had only one brother named Molepaw and many sisters. 

-Spider Paw, Moth Flight's son, was named after the extra toe he had on one of his paws.