As someone who's played many football games at Aloha Stadium (my high school games were played there); that's just the way it is there when it's windy. The stadium is right at the base of a mountain right next to the ocean. This can create some tremendously powerful winds at times. Anything that's not tied down can get blown on to the field pretty easily. Also football fans in Hawaii have a strange love for confetti that i can't understand. Combine those tow things and you get a lot of rubbish on the field. I was always worried about slipping on a piece of paper and blowing out my knee.
I stand corrected.
But I swear I saw a bra laying in that pile of trash around the 40...
I went to a game there, when OU played one year right before "mele kalikimaka" and what I remember most was the deafening sound of the stomping in the stands!
It shook the whole stadium and I was truly afraid the place was going to fall down.