Pause the game, press the A button 8 times and then unpause. This can only be done if you're alive.
In the Graveyard stage, survive for 1 minute and 30 seconds without triggering the boss appearance (don't kill too many enemies). The stage will change to night-time and you'll get 100.000 points.
In any stage, defeat El Doba (the boss) before he fires 10 shots. In the next stage, don't lose any lives. Instead of his normal form, El Doba will appear as a schoolgirl and will shoot faster.
You can do it as many times as you wish, so El Doba appears on his true form on all subsequent stages.
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