I worked at a company doing football (and footballer) tracking for ecery premier league game for a couple of years. Every other week there was a case we hadnt c

I worked at a company doing football (and footballer) tracking for ecery premier league game for a couple of years. Every other week there was a case we hadnt covered (and fixed for the next week); - white ball swapped for orange ball - player swapped shirt, new number. (We tracked players by number on their back) - player swapped shirt to a number someone else had - player swapped shirt to no number - player shirt covered entirely in mud - player swaps shirt where number is white instead of black - white ball left on sideline (2 balls) - crowd releases 50 white balloons onto the pitch - ref swapped shirt colour - sideline advert has a filled in white O on it (moving around) There were loads more, but that was off the top of my head. I dont think we ever mistake a head for a ball though! We worked out likely balls from movement (syncing cameras with bounces)