Of course, physically, you *could* find some common things in mannerisms, facial expressions, etc.
I think the little mention about it, is that it's not part of the diagnosis, and because it's not super obvious, really. I mean, sure, it's quirky, but some people just walk funny anyway and don't have to be on the spectrum to do so.
Look at gang members-in our area, they ALL walk with a limp. It's a very distinct differences from one group to the next-maybe they lift their leg a certain way when limping, maybe they take longer to put that foot down, maybe it's barely even noticeable, but it's still there.
So while walking awkwardly a lot of the time is something that probably many of us do, it's something a lot of other people do, as well. Same with most of our other differences.
On a parenting forum I'm on... it was rather interesting. A few parents kept bringing it up in the photos section-they said we all seem to have almond shaped eyes. Smaller towards the middle and wider on the other sides. It was interesting. Some called them "tear dropped shaped eyes". But I doubt that is all of us... looking at the pictures though, I saw what they were talking about. It was pretty coincidental.
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Sorry about the incredibly long post...
"I enjoyed the meetings, too. It was like having friends." -Luna Lovegood