Hip-Drop Tackle Penalties Onside Kick Alternatives Trade Deadline Movement Challenge of Penalty Calls Fourth-and-20 Play Instant Replay Expansion Competition Committee Proposals Challenges to Fouls Minor Proposals Additional Challenges for Successful Tries Alterations to Onside Kicks Hip-Drop Tackles Kickoffs and Onside Kicks Replay Reviews Touchbacks Tush Push Player Positions Ban on 'Hip-Drop' Tackle Challenge Modifications Foul Enforcement Scoring Adjustments Defensive Strategies Kickoff Rule Jersey Number Rules Jersey Numbering Rules Emergency Quarterback Hip-Drop Tackle Ban Flag Football