I was going to start an officiating thread, mostly to say that the officials did okay except for the bogus facemask call on Crabtree. But these two plays are worth discussing. I think the announcers let us down by not explaining them better.
With the Collins thing, I think somebody (maybe the official) said something about "going to the ground" as part of the celebration. I didn't know there was a rule against that. It didn't look excessive, but if there's a rule against it, they had to enforce it.
As for the Swain play, it had the look of a non-catch to me because he didn't tuck it in. I think the officials have been pretty consistent on those kinds of plays, so I wasn't mad about it, though on the other hand, it was worth challenging.
I did think that it was a pretty clean game from an officiating standpoint. Most of the penalties were false starts or obvious holds. There were no pass interference controversies, which is more a credit to the DBs than to the officials. And the personal fouls by Williams and the Steeler player were obvious.
As I said before, the Crabtree penalty looked like a blatant screw-up. It was sort of a flukey play and I can see how it may have looked like a facemask in real time, but I still say that you shouldn't call a penalty unless you actually see it--and you can't see something that didn't happen.