@SirBlackMage: I remember several equipments in Esto Gaza being essential for Freya/Amarant's skills and missable as well.
There is no indication on the change of the Festival of the Hunt out of the Readme.txt, nor for different minigame tweaks. That's part of the things I prefer people to observe on the spot, as I consider that noticing these differences in-game brings more than reading them in a complete textual log... even at the cost of having chances to miss them. Since there's nothing permanently missable there, I would stick to the mention in the Readme.txt and not refer to it in the description of the mod written for a larger audience.
But since you ask, I would say that the fight against the Friendly Yan has also changed (and it's easily missable) and several jewels can be obtained as rare Hot & Cold treasures while they were in limited amount in the normal game (that is more like a poisonous gift toward people who want to 100% the game, including getting 99 of all the items when possible ^^").
Also, there's a hidden fight against two Sand Golems in Cleyra's Trunk but it can easily be triggered by chance.
The list for treasures to get Excalibur II is
in that topic, as said. It is almost complete: I think there are only the Protect Ring reward for the Nero brother sidequest (disc 4) and maybe the card reward for finding the cat in Alexandria (disc 1) that should be added to that list. They are not counted in the mistake count I wrote though.
@radzrader: Have you tried doing
that? changing the settings in your main "Memoria.ini" in order to force the changes that should be automatic but are not due to a bug.
I am a bit embarrassed because that bug (if really it's the problem for YANA's section, which I think it is) should have been fixed so long ago... It would only require to update the installer of the Moguri mod, but Ze_PilOt uses a custom version of Memoria for some reason and wants a specific installer for the Moguri mod. But then, I never asked him to update his stuff as I thought that he would simply do it when seeing that Memoria gets updated, so I can't really complain about it...
Battling two Abbadons when Beatrix is there is the normal behavior, though they shouldn't be invincible at all (the appearance of Zidane is time-based and the damage done before that is nulled, same as the normal game, although it's not the fairest thing to have).
PS.: There are reports of another bug in Pandemonium after defeating the Silver Dragon. That bug is unrelated to the fixes in Memoria.ini. I suspect that the Moguri mod improperly uninstalls AlternateFantasy (or the BeatrixMod) as it does when touching some of the options in the launcher (another bug of the Moguri mod), but I have no confirmation or denial of that. If that happens for you, temporarily uninstalling the mod seems to be the only option.