Thanks 0celot for the third fact and @TheSilverSunset for the fourth!

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-Kate says that the Erin's are still trying to pick the perfect mates for Dovewing and Ivypool.

-On the Warriors Wikia site, Tawnypelt has 11 (15 counting real) alternate versions of what she looks like, meaning she currently has the most of them.

-Logfur, a warrior from ShadowClan in Code of the Clans, is the only cat with the prefix "Log-".

-In Bramblestar's Storm manga, Hollytuft is apprenticed by Cloudtail, but in The Apprentice's Quest she is mentored by Blossomfall. 

-Ripplestar is in the Dark Forest.