Thanks @warriorcatgeek for the first two facts!
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-When the Erin's first thought up Warriors, Firestar was going to be a she-cat named Ginger instead of Rusty and she was going to be Greystripe's mate.

-Snowkit (deaf one) didn't die! The hawk dropped the kit in the woods by mistake and a Twoleg took him in and renamed him Snowy.

-Cinderheart and Lionblaze's kits are rumoured to be named: Sorrelkit, Hollykit, and Fernkit.

-Whitewing had a brother named Rustkit who died as a kit because he and Whitewing snuck out of camp in the middle of leaf-bare to "explore," and Rustkit froze to death.

-Heathertail and Breezepelt are "friends with benefits."