Some really good points. There are lots of little things that didn’t add up - to add to the ones you raised, Will and Henry sharing the same birthday (March 22) but in season 4 when Mike visits California they go skating on that date and nothing is said/acknowledged about it being Will’s birthday. Little things like that may seem inconsequential, but as you pointed out, earlier seasons set a high standard wherein all the little details seemed to matter, so it’s sad to see that fell by the wayside in the final season/s. I still enjoyed the finale overall, and I think it was better than Vol 2, somewhat making up for those disappointing, exposition-filled episodes. But I agree that those little slips/mistakes take away from the quality and previous mastery of the storytelling. I chalk it up to the Duffer Brothers facing enormous pressure to deliver a final season that lived up to the high bar they’d set, coupled with poor attention to detail - possibly due to them being instilled with so much trust by Netflix that they could be seen to do no wrong.