Thanks @Firestarqueen1212 for the fourth fact and @Shiningspirit731 for the last!
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-If Tom would have kept his kits, he would have most likely abused them.

-Leopardstar is said to have Ocicat blood because of her kittypet ancestry.

-Pineheart was Pinestar's warrior name.

-In Midnight on page 294, it says: "The badger chopped up the root and laid the pulp on Tawnypelt's wound, just as Squirrelpaw had done in the wood." Wood is supposed to say woods.

-In A Forest Divided, Clear Sky thinks 'The dead outnumber the living,' however at that moment only 16 cats are confirmed dead and 35 cats are still alive.