On the pushing;
it is illegal for an offensive player to get behind and push and offensive player for more yardage. i. e. a big OT cannot get behind the RB in a huge pile and push him for extra yardage.
On the hits;
It was a point of emphasis in the off season this year to protect defenseless WR's. Its mostly judgement on some parts, but you cannot lead with your helmet, or hit helmet to helmet. The rule is that the defensive player cannot target an offensive player above the shoulders if the WR is not defending himself.
It is Rule 9-1, Article 3b.
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