First, Esteghlal had a shout for a penalty in the first half. To be fair, there was contact, maybe even enough to be a penalty but the way I know Sharifat, he is a diver. And more importantly, he didn't go down normally which made Wiliams caution him for diving.
The second shout for a penalty came in the second half for Al Rayyan, and once again Williams was correct to let play go on.
The only goal of the match came in stoppage time, and was a close call for the Assistant Referee on the near side who got it absolutely right.