While playing the End To End mini-game, the moment a defender attempts to tackle your player, press Start to see what move (high tackle, low tackle, right or left tackle) he is going to attempt. The moment you resume the game, press the corresponding button. This is a simple way to score 40,000 points and to break the high score to unlock the the Hall of Fame AFC and NFC teams.
In End 2, finish in any level as soon as you see the opposite football player. They will start to move at you. Pause the game so that you can see how they will try to tackle you, then resume the game and escape them for a perfect. This can be put together as a combo to earn unlockables such as music and teams.