Nicholas said the day before the game that we only had 200 tickets left to sell. Either he was wrong or the white seats you saw yesterday were spectators either moving to get a better view and standing perhaps in the front. Anyone have the official ticket sales/attendance for the game?
There isn't much of an "away fan" culture in Italy compared to other countries (England, Scotland, Germany etc). The only teams in Italy who travel with big numbers usually are the big clubs like Juve, Inter, Milan, Roma and Napoli.
Also the Tessera Del Tifoso ID Cards have also screwed away fan numbers in Italy even more.