These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
YMMV: The Lion, the Witch, and the Wardrobe
Everyone Is Jesus in Purgatory: Word of God says the book is hypothetical speculation on Christianity if Jesus existed in worlds that were quite different from ours. Of course, most people just thought it was a charming fairy tale.
Fair for Its Day: Lewis has taken a lot of flak for his Values Dissonance-laden statement that "battles are ugly when women fight." But other books do show that Susan and Lucy and Jill Pole are capable enough to hold their own in a battle. Even the U.S. Military didn't allow women in combat zones until the 1990s, and not in direct combat at all until 2013. Men Are the Expendable Gender, after all.
First Installment Wins: The Lion, the Witch, and the Wardrobe is the best-known and most adapted book of the series.
Foe Yay: Some signs of it between Jadis and Edmund. Though it goes a little on the Memetic Molester territory since she's an immortal adult and Edmund well....10.
Most of the casualties in the Walden movie's final battle are brought back to life either by Aslan's Breath of God or the fire flower potion. There was one real casualty, though: the griffon who is stabbed by Jadis' staff in mid-flight and shatters on the rocks below. The bad end? His body stays stone forever - in pieces - in an And I Must Scream frozen moment. The good end? He comes back out of stonestill in little pieces.
Perhaps Aslan had the ability to put him back together, before un-petrifying him?
People and creatures petrified by Jadis's wand don't seem to be aware while they're stone. The griffon is clearly dead no matter what, but that's all. Presumably there were also plenty of combatants on both sides who died of conventional wounds before Lucy arrived with her cordial, as well.
If Aslan did not put the Gryphon back together before unpetrifying him (which should be noted is not beyond his abilities by any definition of the word considering that Aslan is the analogue of Jesus), it stands to reason that the Gryphon simply died since his body was beyond recovery. And if you look at the other books in the series (namely the Dawn Treader, the Silver Chair, and the Last Battle), he would've almost certainly ended up in Aslan's country (aka Heavan) if that were the case. The situation isn't nearly as bad as it first seems.
How horrible would it be to return to being a common child in 1940s England, with all the knowledge of twenty or so years of being an adult King or Queen in Narnia?
They all have to go through puberty TWICE now!
In the books, it was stated somewhere that memories of the real world become faint, dreamlike, when in Narnia long enough, and vice versa. This was apparently not noticed in the film adaptation of Caspian.
One Running Gag in the novel is that one should never shut oneself in a wardrobe, because if you do you'll be locked in. Edmund forgets this key piece of advice and does so anyway (although he is able to get out later). When the bloopers for The Movie came out, one of them was Skandar Keynes (who plays Edmund) shutting himself in the wardrobe, and consequently getting locked in.
When Edmund complains that it's raining outside, Susan mentions that they have a "wireless" inside to entertain them.
Mr. Tumnus, particularly in the movie, where there's an added scene of him meeting Edmund in prison and, despite obviously having been hurt during his stay, is more concerned about Lucy's wellbeing than his own. Not to mention that his petrified body looks like he was either terrified or in a lot of pain, before being frozen.