I just figured out that the lower seed fans sit on the opposite side from the team bench. So in LA, Arizona fans were behind the Wildcats bench while Clemson fans opposite side of our bench in game 1. In game 2, Tar Heels used same bench as Tigers with Tar Heel fans behind them, and Bama fans opposite the Bama bench / Zona fans.
In Dallas, Houston fans will be behind NC State / Houston (game 2) bench and Wolfpack fans on opposite side. The Marquette fans are behind the Marquette / Duke (game 2) bench, with Duke fans opposite. Duke and NC State fans on same side opposite the benches.