Hard to put a finger on it, but he saw a lot of fouls I did not see (but I'm just a very low class amateur referee), mostly by Schalke payers. And for some reason he completely missed Porto keeper Helton touching the ball outside his box. And there was another hands ball.
The red card for Fucile. The yellow cards and his decisions during the rest of the match.
There are not many players like Quaresma. Schalke don't even have a player who can shine his shoes (still they won). It was great to see him taking a free kick with his right foot coming from a right angle He almost fooled Manuel Neuer. Almost..
A lot of teams get sponsored by gambling syndicates, Porto get their money from the Russian mob.