So many things rushed, we should have had a scene of Dany and Missandei to emphasise how important their friendship was to Dany, especially when she's surrounded by people who oppose her.
I'm guessing Butterfly Fever doesn't exist in the show
because it'd be weird that the Unsullied had never heard of it, especially as a bunch of them were probably abducted from the shores of Naarth too like Missandei. But it was all I could think of every time going to Naarth was mentioned, since it's one of the most well known things about that place in the books other than the natives being pacifist.