Too often games are decided or heavily influenced by an obviously wrong PI call or non call. On scoring plays and interceptions which are already automatically reviewed just add it to the process. If you see a receiver blatantly push off negate the score. If you see an interception aided and abetted by DPI then negate the turnover and give the offense the ball and the spot foul. So right there you can correct quite a few incorrectly called plays. Then add one team challenge per game and include DPI and OPI to the list of reviewable plays.