Those are markers that note a closer look at by security. That was completed. He had no background that I'm aware of to tip anyones hat, he had special attention above and beyond what every other passenger received.
A a pilot who commutes to work (not in uniform), I meet some of those parameters. I am a last minute addition to the DM, one way pass, I offer no address other than company headquarters and no checked bags. What did it get me? A special date with security at the gate for an extra patdown and an examination of my flight case and roll aboard. After finding nothing, I was always allowed aboard. The only difference was I'm a white male, somewhat cleancut.