The early Final Fantasies are interesting to return to, as they show the origins of various things that have become series mainstays over the years.
Today in Final Fantasy II, we see the first mention of the Dragoons in the series; while you can’t actually be a Dragoon in Final Fantasy II, you do learn a little bit about them and their companion Wyverns. We also see the Lifestream for the first time; this concept hasn’t been in every Final Fantasy, but it does play a prominent role in both Final Fantasy VII and, of all things, the CG movie Final Fantasy: The Spirits Within. Bet you’d forgotten about that, hadn’t you?
Maria also spends a lot of time training her Scourge spell, and we get into a real mess trying to get back out of a dungeon. Because, well, we’ve set a certain amount of precedent at this point, haven’t we?