Seafoam Islands hidden text box and 'slowdown' glitch (Red/Green/Blue JP)
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In Red/Green, pressing A on a certain position in the Seafoam Islands' right island entrance causes an empty text box to appear then immediately close itself. In Japanese Blue a blank text box appears too but in this case no audio plays anymore and the game hangs; you can't close the box. In Japanese Yellow and the localizations the hidden text box was removed completely.
Itemfinder does not detect an item here in both versions.
The position is here, in front of Red: http://i.minus.com/j9wowWJmIWu0V.png
After the message has been closed, the game will take a longer time at scrolling through the Pokédex with right or left on the d-pad, displaying the options on the 'summary/switch/cancel' box and at showing your Pokémon's status, due to the byte D2D7 being kept at 03, when it's normally kept at 01 for most of the time, only changing to 03 for a fraction of a second when you view certain messages. The 'slowdown' can be fixed by pressing start and going into the options, then exiting. D2D7 is not to be confused with D2D4, the Japanese options address.
The webpage I found this, in Japanese: http://hakuda2.web.fc2.com/wario/poke1/k15.html
It refers to the glitch as the Twin Islands (Seafoam Islands) 'mine' (as in landmine) bug.
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