They were surprising calm about chopping up zombies that used to be their friends. Okoye even slices Falcon in half in front of Bucky and says "sorry about your friend" and he says "I should care about that but I don't" or something.
How exactly did Scott Lang survive as a head in a jar? That seems beyond MCU science so far. I mean, can you speak without breath in your lungs, if you have no lungs? Etc.
I thought it was strange that the zombies know how to use all their powers and seem to form strategies but yet have no memory of anything else? Like old friends.
When Thanos popped up I wondered how he could retrieve the Soul Stone as a zombie, because then he wouldn't love anything (except brains) and sacrificing a daughter doesn't mean as much if she can survive the fall as a zombie. But maybe he collected it before they became zombies.
There should be so many ways thanos could avoid becoming Zombie, as Gems would protect him from thast!