Tuck Rule: neat idea, absolutely no way of truly determining if its an incomplete pass or fumble. Needs to go.
Challenging a reviewable play: I'm actually against this. Coaches should know this shit.
Incomplete pass reviews: Good stuff.
RB's can't lower their head: LOL RIP MARSHAWN LYNCH. Basically this would get flagged now days - https://www.youtube.com/watch?v=Zt62eVLZprc
Peel Blocks: Cause of Golden Tate probably.