Illegal contact. Defensive holding.

Agree, I think that I have been seeing plenty of offensive PI's NOT called. However, maybe that would result in even more flags if they were called.

You guys must not actually be football fans, because *real* football fans WANT MORE POINTS! It's Goodell's LAW: MORE POINTS = BETTER PRODUCT. DUH!!!

I'd love it if those changes were made, but it will never happen. The most we might see in terms of rule changes that favor defenses is eliminating some forms of blocking that tend to cause injuries. That wouldn't be to "balance things out", but because teams sink a great deal of money into guys like JJ Watt and Terrell Suggs, and owners don't like it when big money players are on IR. It's gotten to the point that even casual fans know records like Peyton Manning throwing for 55 TDs or the Broncos scoring 600 points on offense are just meaningless fluff manufactured straight from the league office (going by the way the rules were interpreted just a decade ago, you could shave off a dozen TDs and the better part of 100 points from those totals). Even though I didn't like seeing the Seahawks win, I loved the final score of last year's Super Bowl. You just know that Goodell was fuming all game long watching the Broncos offense stink it up, in spite of all the tweaks they've made over the past ten years to make it easier for quarterbacks. It's worth noting that the first batch of increased emphasis on penalties against DBs came after another noteworthy Peyton Manning post-season meltdown.