Thanks FoxyFire07 for the third fact, @Doglovermastiff for the fourth, and @AshelyJohnson12 for the last!
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-Blackstar is possibly a descendant from Moth Flight and Spider Paw.

-Skywatcher might be getting his own book.

-In the Spanish version, Purdy is called Puma.

-On page 467 of Moth Flight's Vision, Bubbling Stream is referred to as Bubbling Spring.

-In Moonrise on page 134, Stormfur is referred to as Stonefur by mistake. 'Brambleclaw was calm, his amber eyes meeting Stonefur's in a level stare.'