Thanks @1warriorcatfan for the first three facts and @NightShade105 for the fourth!

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-Quite Rain grew to be a mother figure to Sun Shadow.

-Greystripe had a vision of Silverstream when Millie was kitting.

-Silverstream appeared in Millie's dream to tell her she approved of her.

-In The First Battle, Misty the rogue was listed in the allegiances, when she was killed in the previous book, Thunder Rising.

-Vicky has said that the Erins considered writing a book based on Crowfeather, but they weren't sure there was a story about him that no one already knew of.