I've heard that sports scouts are starting to use YouTube to look for new talent because it's easier than travelling all the way across the country to look at one kid who might be worth your time. The problem there is that the video can be doctored in very subtle ways, and it doesn't even have to be edited. For instance, you could mark a football field in nine-metre increments instead of ten to make kicks and throws look longer than they really are.
Mokalus of Borg
PS - That's just one example.
PPS - You could also use non-standard equipment to enhance the performance.