After Doctor Sloan has been struggling many times to go through the metal detector cleanly, at one point, mid-way through the show, a lady and 5 gentlemen, 1 in a wheelchair, go through without any alerts.
At the end of the episode (#5.4), Steve brings out a game called "mancala". Mark says (something along the lines of), "I think I know this game; I knew it as Nine Men's Morris"
Nine Men's Morris is an entirely different game, played on a board of three concentric squares. It looks nothing like two rows of six depressions. And there are far fewer playing pieces.