I was playing a "become a legend" game then there was a big error which I discovered.
The player just shot the ball through the opponent.
There is more he just shoots by penetrating through another players leg.

Look at this link for details.

http://boredlives.blogspot.com/2009/05/pro-evolution-soccer-2009-glitch-found.html

Not that big of a deal if its very rare.