I don't remember any of these. xD I suppose I'll throw in some guesses nevertheless.

(SPOILER)
1. In Final Fantasy, how much GP does your party start off with in the NES version?
100

2. In Final Fantasy, what do the citizens refer to the city of Cornelia as?
Coneria

3. In Final Fantasy, where can you buy a Longsword?
Elfheim

4. In Final Fantasy II, what can Guy do that no other characters can?
Learn enemy abilities

5. In Final Fantasy III, what was the name of the cave discovered by the Onion Knights?
Spirit Cave