Fairly accurate... here are some corrections.

Zidane's Ultima Weapon: On Disc 4, go to the place where the Shimmering Island was, and use a Dead Pepper. There are no foaming, so make use of the map blip on the third map display to know where you are.

Quina's Gastro Fork: Catch 99 frogs and Quale will challange you to a fight, as a price for winning, you'll get the Fork.

Freya's Dragon's Hair: Use a Red Chocobo (or higher) and go to the western crack on the Forgotten Continent, use a Dead Pepper to open it, and inside you'll find Dragon's Hair among other things.