AFAIK I'm neurotypical... No, trains of thought like these are common (see also other respondents on here), and they can also happen in the blink of an eye. It's just that when the question or comment has formed, I'll make a mental note to either ask/mention it later after the current topic has concluded, if I think the other person also has interest in hearing it, or to google it later if not. Or to just drop the thought if I come to the conclusion that it doesn't matter all that much to myself either.