You never contest an official's call when the penalty is against the other team (Unless declining it results in more yards). Period. The problem you run into is the officials are never going to get all the calls right, and there's going to be a lot of stuff that's missed. As an example, there were multiple blatant holds against Cal 1st half. They finally got called for it on their last drive of the 1st half. Had they been called for it on the previous drive it probably prevents them from scoring their first TD. I know the adage is that holding can be called on every play, but some of it was pretty bad. I'm talking multiple linemen having our guys by the backs of their jerseys on the same play. They were getting beat bad in the trenches.