"They definitely add, uh, something." Perhaps her home is covered in crazy thorns all the time, so this is, like, familiar? Michael is trying not to be rude.

He's slightly familiar with illusion magic, but not enough to know that's what he's looking at. Harlan's thing is snakes, not thorns.

"And yep. Guilty as charged." Now that she brings it up, there... kind of is a disproportionate number of Americans, isn't there?

"I'm gonna guess you're from somewhere that's probably not even on Earth?" That seems to be the divide, actually: America and Not Earth. Apparently the Door doesn't give a shit about other countries. "I'd guess a country, but I haven't heard the same one twice."