As pointed out by Mike Pereira, the NFL makes a bunch of rule changes each year that aren’t technically rule changes—the rulebook wording can be adjusted under existing rules without having to send something to the Competition Committee. We’ve got some new ones for 2016, and they’re all direct responses to things that happened last season.
1. Packers WR James Jones took the field wearing a hoodie under his jersey, and it actually managed not to violate the league’s draconian uniform policy. (But only because it was an approved team color, the sleeves were the right length, and it was made by an NFL apparel partner.)