I don't have trouble keeping up WHILE watching most movies, but it is hard to distinguish if I do or not the first time I watch something, as I often put it on repeat and watch it over and over for a week. By the end of it, I'm reciting the lines while not watching it, I have no clue who is saying what and all, of course, but I get the basic idea of it.
I can never recognize a character by their name when discussing a movie after watching it, but if someone mentions the way they were standing, or a particular scene, I will ask if it was the guy who was wearing such-and-such a thing. I can remember clothing and all, but I cannot remember for the life of me their character names or real names if they are used to try to get me back on track.
It's very common to hear me say when discussing a movie "and then that one guy with the red coat used that thing and chased the guy in the black pants...." lol.
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Sorry for the long post...
I'm my own guinea pig.