If you get yourself killed, wait for the Game Over screen to appear, hold A + B + Down and press Start. If done right, you'll go to a Continue screen where you'll get 2 free continues.
At the difficulty selection screen, hold Up + Left + Select and press A to start the game. If done right, you'll see all the game's cutscene images one after the other.
While playing, press Start to enter the status screen and hold A + B + Select. This will make the time counter go faster. To see the changes in the counter, just press Start to go back to the game and enter the status screen again.
