Social cues that he misses are not interrupting either verbally or physically and respecting an orderly progression (like lines for things) that's what I mean by "bubble".
So the obvious thing to try would be to make a cartoon of kids lining up and showing a child who 'cuts' in line, and asking your son what the child is doing and if it is wrong. Ask him what the other kids in the picture are thinking. I think the first thing to find out is if he doesn't know or he know and can't control himself, or if he knows and doesn't care. One behavior can have lots of different stuff going on beneath it.
As for the interupting, well, I've seen in my son and a few other gifties that they fear that they will forget what they are going to say. I think that the overexcitabilities and anxiety can also drive the intensity of the fear of forgetting what one was going to say.
Just some ideas...
Best Wishes,
Grinity
