I heard a story about this from Jack Morris when he was interviewed as a Twin one time. Jack was in the bullpen when the 1st game was ending. He said that the smell of pot in the air was as thick as he had been around. Fans were really getting into the entire evening.
Also, a buddy of mine was in the upper deck, he did not participate on the field. Not sure this is true or not, but he said when fans stormed the field that there were some kids who slid down the foul pole from the upper deck to 1st deck and then hopped onto the field.