Unless they have changed the setup, it is the same as for Equus -- one of the barricades is set up so that the area closest to the stage door is reserved for people who saw the show that day. So even if there are other people already waiting, the people who saw the show still have a chance.
And when I saw the show, Jude Law did something extremely nice -- he first signed for the people on the "just saw the show" side, then he went to the other side, then he came back to the original side and said, "Anyone else have a Playbill?" and specifically signed Playbills for a few extra people. I thought that was very classy of him. I don't know if he routinely does that or it was just that one time.
"What was the name of that cheese that I like?"
"you can't run away forever...but there's nothing wrong with getting a good head start"
"well I hope and I pray, that maybe someday, you'll walk in the room with my heart"