Or always giving the generic answer even in situations where it's supposedly obvious to neurotypical people that you're supposed to give the honest answer.
As a kid I knew something was off (I didn't have the language to call it something) because I couldn't answer T/F and multiple choice questions honestly due to nuance. I often knew the answer the teacher was expecting but to answer it according to that assessment felt intellectually dishonest.
personally? bad eye contact. accidentally using innuendos because there's 80 million of them and I forgot to consider one of them when I was speaking. not catching somebody's meaning when they hid it in an innocuous statement. severe irritability in the cold or around loud continuous noise. overstepping a social boundary and abruptly withdrawing half an hour late when it dawns on me what I did. having no boundaries to other people because I'm trying to be personable and blend in when I don't.
all together that sounds pretty obvious but it never happens all at once. if I've gotten enough sleep then I will mask most of it, whether I want to or not
I actually found this quite hard when I first looked into ASD. It felt like a list of all the things that I thought made me unique but were just autistic traits.