Seriously, I've had people say that an Eastern European facial structure looked the same as a Mexican one.

Haha, I would probably be that person. I'm really downright BELOW average when it comes to that sort of thing, or even just differentiating faces in general (hence why it's always ridiculously exciting for me when I recognize an actor from movie to movie XD).

I second the doubt that Anita is as observant as you, or knows what to look for to tell who's what. Well, maybe she'd be that observant if Vivian were a man...