That one 'blindingly obvious' thing is key often for me too. Sometimes it's not only not obvious to other people but it's entirely wrong too.
Ironically, it's often the same thing the other way round: the neurotypical leaves off or implies some context that seems obvious to them and the people they normally communicate with.
The other main thing, from neurodivergent to neurotypical, is (not) implying emotional meaning. (And vice versa, not picking up on it.) You say something and mean it logically, but hidden in your words is emotional meaning - sometimes it's real but you wouldn't even know it yourself; sometimes it's not real just you said things in a way that someone else would if they meant that extra emotion. Communication is about emotion as much as facts, and the listener rightly tries to pick up on emotions, but misunderstands.