The Simpson Celtic goalie was hit by a stone and had to be substituted. Celtic finally got a penalty, Racing scored an off-side goal (according to the Argentinian press). There was no water for the Celtic in their dressing room. The Scots say Esteban Marino did a bad job and seemed to be afraid of the audience. There had to be a play-off to which Celtic agreed only if the referee was replaced.
source: David Goldblatt: The ball is round