**Warning: A bit of ranting takes place in this review (and possibly some spoilers), so read at your own risk.
Several things about this novella annoyed me, namely the timeline.
"One moon had passed since her dream of the three little stars, and leaf-fall was giving way to the coldest season."
First, this novella is supposed to take place right after (and even a little during) Sunset, book 6 in The New Prophecy arc. I literally just finished rereading that book before starting Leafpool's Wish, and I know for a fact it did not end with leaf-fall, but rather just after newleaf arrived—so how the heck? However, that being said, I know The Power of Three arc came out long before Leafpol's Wish, and according to The Sight, Jayfeather, Lionblaze, and Hollyleaf were born in leaf-bare. So it's hardly surprising Leafpool's Wish takes place at the end of leaf-fall. But that just pegs the question: weren't the Erins paying any attention to the timelines? Even before they wrote Leafpool's Wish, how did they fail to remember that Sunset ended in early newleaf? Therefore, Leafpool's kits should have been born in newleaf. Or, they should have orchestrated one more romantic night between Leafpool and Crowfeather months later, in late greenleaf or early leaf-fall, despite their decisions not to see each other anymore.
"Firestar [...] recovered from losing a life."
Okay, this one I'm not 100% on, but I'm pretty sure, according to the end of Sunset, Firestar did NOT lose a life. At the very least, it never specifically said he did, though I suppose there were times when it didn't mention what Firestar was doing, so I guess he could have lost one and nobody noticed until later, well after the end of the book. But the real reason I think the Erins decided that, for Leafpool's Wish, Firestar lost a life to the fox trap was because, if we say he didn't lose that life, he would have had one extra at the end of The Last Hope (I counted his deaths), and therefore wouldn't have died for good. Or maybe they always intended him to lose a life at the end of Sunset and just failed to say so at the time.
"She didn't want Sorreltail [...] it was this experienced queen."
Uh, in what way is Sorreltail, young warrior and first time mother, an "experienced" queen? Experience warrior, perhaps, but not queen.
"I know you saw me in the Dark Forest with Tigerstar and Hawkfrost."
Hmm, actually, Brambleclaw, you didn't know that. You just considered and dreaded the idea that Leafpool might know.
"Hazelkit was distracted by their father, Spiderleg..."
Uh, Spiderleg isn't their dad. Spiderleg father's Daisy's second litter of kits, not her first.
"Then she was not back in StarClan, but in a memory of the time she had spent with [Crowfeather]."
Okay, this part I liked. You never really saw this side of Crowfeather in the books, and I absolutely loved seeing it here. I just wish he wasn't such an annoying furball in other books!
"I think she dislocated her tail."
Me too, Cloudtail. I didn't even know that was possible. o.o
"Go back to your Clan, Crowfeather. I won't let you ruin everything again."
Great StarClan! Could Leafpool have been any crueler?
"Squirrelflight, you will never have kits of your own."
Umm... then how do you explain Alderheart, Sparkpelt, Dandelionkit, and Juniperkit? Unless Yellowfang really was lying when she said that, in which case, she's quite cruel herself.
"Squirrelflight told her, her amber eyes fierce."
Aw, come on! When has Squirrelflight ever had amber eyes?! Everyone knows her eyes are green, like Firestar's!
"Suddenly he slipped on a wet leaf and bumped his nose against the bark wall."
Teehee, this made me giggle.
They crossed the border close to one of the tunnel entrances.
Uh, ThunderClan didn't discover those tunnels until The Sight, i.e., until Hollykit, Lionkit, and Jaykit became 'paws.
"Live well, my darlings. You will always be in my heart."
For this, I would just like to comment that I just happened to be listening to "You'll Be in My Heart" by Phil Collins from the Disney Tarzan soundtrack as I read this line. I thought that was quite good timing. xD
Well, there you go! Several annoyances, but otherwise, another great Erin Hunter story. The second half annoyed me less, and so long as I ignored the little things, I quite enjoyed this.