I wasn't going to do either of these (and you'll see why soon) but since they came up in the discussion about Zeynep's ongoing Final Fantasy play-throughs i figured i might as well make a stab at it.
Like most Americans i didn't even know that the "real" FF2 and FF3 were not the same as the ones which were published under those names in America until years later.
I've played a little bit of both of them, one was on DS, the other was either DS or GBA. But i've never gotten all the way through either, so my "memories" of both of them are an indistinct haze of what little i remember about both games and what little i've heard about them on the net, all mashed together.
Technically Spoilers (If I Remembered Anything Right)
4 Onion Knights who fall in a pit.
4 Other people who get involved in the story some way or another.
I'm pretty sure one of the groups is orphans, but i'm not sure if it's the Onion Knights or the other ones.
Cid makes his first appearance in one of these! I'm going to guess... 3?
Chocobos make their first appearance in one of these! I'm going to guess... 2?
Moogles may or may not make their first appearance in one of these! I'm going to guess... yes?
It's been established in the conversation that inspired this post that FF2 had the "hit yourself in the face to get stronger" system, which has never been copied again in any other Final Fantasy game. Which must mean that FF3 had the first switchable Class/Job system. Except as best as i can remember there wasn't a huge benefit to mastering more than one class. Though i could be wrong about that.
There's a big Empire that's trying to take over the world, and you have to stop them! (Shocker!) Actually i guess this would be the first time this happened in an FF game as well, since there was no evil empire in FF1. There may or may not have been an emperor as a prominent character.
One of your friends from early on in the game turns into or turns out to be a bad guy. I'm not sure if they switch back again, or switch multiple times like a certain dragoon that we'll come to know and... love? Strangle? Something like that?
And i've totally forgotten how crystals work into either of these games. But they've got to be in there somewhere, right? :)
And that's all i've got. Like i said, it was just a bonus round.