Thanks Starlingfall_Potato for the first two, SkyeWolf for the third, and TacoNyght for the fourth!
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-Goosekit sees a small black-and-white tom in Goosefeathers Curse, and some fans say that his appearance is an omen of Swiftpaw's death. 

-Mapleshade developed schizophrenia after the death of her kits.

-Cloudberry the medicine cat was given to them by RiverClan after the death of Ravenwing in Goosefeather's Curse. 

-On page 351 of Firestar's Quest, it says "Not ever cat sits vigil for the whole of the night." "of the" is not needed in this sentence.

-No matter what their morals are, StarClan will give the cat becoming leader nine lives.