I didn't think McClean did a huge amount when he came on. The only way his substitute impacted things was the crowd got massively behind the team for about 10 minutes. The real impact changes were Cox and Walters. Questionable decision at the time, but they totally changed the way things happened up front. Really great finish from Cox but the defending by the Czechs was awful.
Poor enough performance by both sides, disappointed that Coleman or Duffy didn't get a run out but it's to be expected of Trap at this stage. I would fear for both players place on the plane to the Euros at this rate.