Well, the biggest thing that I think would have changed would be the origins of Jadis.

In LWW, C.S. Lewis states that Jadis is part Jinn, and is descended from Lillith. For the record, Jinn's are our equivalent of "Genies." PHENOMENAL COSMIC POWER. . . itty-bitty living space (Sorry, couldn't resist). Lillith, according to Arabic (I think) history was Adam's first wife who was so wicked, that God destroyed (or banished?) her, and made Eve.

Now, we can clearly see the contrast between this statement, and the majour plot development of Charn in MN, which I don't think needs explication.

Yeah

There was a bit of inconsistency regarding Jadis's origins alright. I also think that the links between the Narnian and Archenlandish royal houses could have been explored more and why the Archenlanders didn't step in when Narnia was without a King before the White Witch and after the Pevensies before the Telmarines invaded.
I would have also liked him to go into how all the friends of Narnia met up in England and how Digory / Professor Kirke revealed to the Pevensies about his visit to Narnia.

Also wondering how, if Aslan's kingdom could be travelled to by heading into the Western Wilds as Digory and Polly di in the first day - why did noone else discover this in all the years of Narnia

Also wondering how, if Aslan's kingdom could be travelled to by heading into the Western Wilds as Digory and Polly di in the first day - why did noone else discover this in all the years of Narnia

Because Aslan's country couldn't be reached by heading west. Digory and Polly go to a garden in the Western Wild, not Aslan's country itself. In LB, everyone that goes through the stable door travels to the same garden, only this time they're in Aslan's country because they went through the door. Does that make sense?

But didn,t Reepecheep come out of that same garden at the end of LB to greet the friends of Narnia and when they went inside weren't they in Aslan's country?

But didn,t Reepecheep come out of that same garden at the end of LB to greet the friends of Narnia and when they went inside weren't they in Aslan's country?

Yes, but they were already in Aslan's country before they entered the garden because they had gone through the stable door. The garden didn't lead to Aslan's country, the stable did.

Getting back on topic, I wish he would have added what became of Caspian's cousin. I assume he died because in SC Caspian doesn't know who should be the next king, but if his cousin was still alive he (the cousin) would be king by right of succession.

Nice Aladdin reference there, Digs.

Another thing he might have addressed could be the fate of the Tree of Protection. In MN Aslan comments to the effect that Jadis has to stay far away from it and indicates that it will protect Narnia for a long time (possibly foreshadowing what has already been written in LWW), but I think a little more detail on exactly what happened to the Tree (so Jadis could invade Narnia before LWW could begin) would be fun. Was it damaged in a storm, like its English counterpart? Was it somehow chopped down by minions of the Witch so she could invade? etc, etc...

Another thing that always irked me was the presence of the witch's baddies in the first place. Aslan didn't create (or at least we're not told in MN that he did) Minotaurs, Hags, People of the Toadstool, Wraiths (spirits of murderers), Efreets (fiery-winged troublemakers of Arabic lore), etc. . .

I always wondered if somehow, the witch herself created them, but then again. . . I don't think she could, because if we're going off of the assumption that Aslan is a metaphorical reference to God, than no other being could possibly "create" anything. So that option is out the window.

What I wonder is, whether or not there was some sort of uprising, something that would have put a good deal of Narnians at war with the crown (or lack of a crowned leader as has been pointed out) which caused said grumpy groaners to. . . in essence, secede. If the witch promised them the kind of leader that they had originally wanted, and if the said detractors were feeble minded enough to believe her, then they very well could have become her minions, and could have taken on more evil shapes to suit their evil hearts, and evil master.

Just a thought. . .

What I wonder is, whether or not there was some sort of uprising, something that would have put a good deal of Narnians at war with the crown (or lack of a crowned leader as has been pointed out) which caused said grumpy groaners to. . . in essence, secede. If the witch promised them the kind of leader that they had originally wanted, and if the said detractors were feeble minded enough to believe her, then they very well could have become her minions, and could have taken on more evil shapes to suit their evil hearts, and evil master.

Or, since she is a witch, could she have mutated them? In Lord of the Rings the Orcs were made by what-was-his-name-the-villain-who-came-before-Sauron-I-think(why am I always forgetting stuff like that?) torturing the elves. He did not create the Orcs, but they were, in essence, his "creation". Could the White Witch have done the same?
Just my random thought. I think I like you're idea better though.

Another thing that always irked me was the presence of the witch's baddies in the first place. Aslan didn't create (or at least we're not told in MN that he did) Minotaurs, Hags, People of the Toadstool, Wraiths (spirits of murderers), Efreets (fiery-winged troublemakers of Arabic lore), etc. . .

It would have been the perfect world except that Jadis managed to get herself into it. I sort of think that's where all the "baddies" came from...creatures and animals that eventually turned over to her side. Not sure why though.

Mr Beaver says that 'there have never been any of your kind here before', and Tumnus has a book called 'Is Man a Myth?' Either Lewis would have to change this, or else (better, IMO) explain how the presence of Men in Narnia's past had been completely forgotten (as part of Jadis' propaganda, no doubt).

I agree that the main theme that needs clearing up is Jadis' origin - but also her role and function. She's a part of the Magic from the Dawn of Time - the Stone Table has been used before - those things are not consistent with the later developments.

It's also unclear how long her winter has lasted. LWW never says that it lasted a hundred years, although I believe that this is said later in the books, not just in Lewis' timeline. Tumnus describes customs from before the winter started, although he never states that he lived in those days - I also get the impression that Mr Beaver had been working on his dam before it froze.
But Father Christmas says that the witch has kept him out for a long time, and the prophecy is 'from time out of mind' (although it could be from the time before the winter, if Jadis ruled for a while before making the enchanted winter).

He might also have made clear when exactly Queen Swanwhite lived, or if there were possibly two by that name.

I've never had a problem with Jadis origin. I guess I just assumed that the people who lived in Charn fit the description in LWW. The main thing that bothers me is that statement by Mr. Beaver since there had been humans there before. I also wonder about the old days and how much Tumnus knew about them, especially if he was a middle aged faun by HHB. Mr. Beaver's dam poses a problem too. It also doesn't make sense that the Witch wouldn't know what a human looked like (she asks what Edmund is) and Mr. Tumnus knows to ask if Lucy is a daughter of eve. Also, when Aslan, the girls, and the newly restored Narnians reach the battle the book states, "There stood Peter and Edmund and all the rest of Aslan's army fighting desperately ... But [the Witch] did not seem to be using [her wand] now. She was fighting with her stone knife. It was Peter she was fighting." Emphasis mine. If the witch was fighting Peter, Edmund would have already been wounded.
I'm sure Lewis would have added to the book that the creatures eating the feast were also restored to life.