familiar accents

I spent much of the evening in a diner, drinking coffee with cream but no sugar, reading a newspaper. I usually put sugar in my coffee. I usually don't go out alone on a Saturday night. I usually don't read the newspaper. Tonight was not every night.

The waitress talked to me occasionally, but mostly just to make sure I was okay. She didn't say much to me. She talked to some of the other patrons, too, and some of them I got the feeling she knew. About half an hour into the evening, while I was eating my club sandwich and generally feeling tired, I noticed that she was greeting the couple behind me without an accent.

She spoke with an accent to me--not strong, but noticeable. Did I look like an out of towner, or did I look like a local? Was I just not hearing her right? I didn't ask about it but I left a good tip and smiled as I left. No sense acting like anything is unusual.