I'm not sure if its a bug or something but i already show it to 38 villagers and runout of ppl to show. There is a rabbit villager that says "is lost in thougth i should show him later" bu it says the same thing during all other hours. Any idea?

You've shown it to plenty of people.  It's not very clear atm, but I plan on updating that.  There is a gift item to give to Mandilitrio as well.  It's another mushroom hidden in the Grotto's main entrance.