I thought he was very lenient on their full backs; pushing Sterling and Mahrez in the back and nipping at their heels at every opportunity- they both should have been carded very early on in the game.
The Rudiger challenge should have been a red; the only intention that can be inferred by his action was to injure/clatter an opponent- though I'm sure he didn't intend to injure KDB to the extent that he did.
Gungodan was also lucky to stay on the pitch.
He was though, as others have said, not at all the reason we lost.