The ref thing has been eternal. And no matter what they do some folks will never be happy.
We used to watch games with no instant replay. Then we got instant replay. Then we got super slo-mo replay. Then we got the official on the field review, and the call to New York, and the red flag, and the retired official in the booth.
Some of these calls that people bitch about can only be seen from one specific camera angle and single stop frame reviews. And to reverse a call it has to be clear and evident. Clear and evident in 1/100 second of time? GTFO!
I suspect, in fact I can guarantee, that there will be controversy in the spring leagues too. We won't hear about it as much because the sport isn't watched and supported as much as the NFL.
I think some of the rules need to be tweaked. Holding is one rule that I despise. Let them hold. If a lineman doesn't want to be held then take care of it. By week 3 all of them will have their fingers in casts. If you are a receiver and don't want to be held then get clear. The old go long and I'm going to throw it short interference play needs to be ruled as uncatchable and no foul.