Idk if you picked up on this but the giant goldfish that they had to go through after Little Garden is a direct reference to an old story that Usopp told Kaya while trying to cheer her up. Moreover, the two giants said that they had landed on an island only to realize that it was the fish’s poop which is exactly what Usopp said in his story! Just got to love those little tie ins that Oda throws out there.