From what I can remember off of the top of my head, I think there was a couple situations with the hot springs with Lucky acting like it was the first time being there multiple times. I might be remembering it wrong though, and slightly unrelated, but I do remember being able to invite someone to the hot springs through the potions menu before ever inviting them for the first time through dialogue.
Love the game btw, one of my top 3 for h-games.