Some faces can be very similar to some people we know.
Have you ever mistook somebody else with some other person? I did but I never called out to them....fortunately.
Anime character faces look very similar and only a few anime characters might be there in real life without cosplay xD
I am talking about real people who are similar to each other but not twins xD
I am bad at distinguishing peoples face if I have no relation to them. Mistooking somebody happens to me when I am just met someone, for example is the first day of the class.
I've never met anyone who looks like someone I know, but there was a guy that came into the store I work at who looked similar to the guy that plays Iron Man. My friend at work had to cut plywood for him and when he was done I was like, "Dude, was... was that Robert Downy Jr.?" And they agreed so I'm glad I wasn't the only one thinking it.