Sometimes, when a game is translated to English, more than the language gets changed!
With that thought in mind, I've set out to film both the English and Japanese versions of GSC (with some help from some friends) so you can see the differences between the two:
Here's what I've discovered so far:
1. Starting the Game.
--I have included the title screen with my version (the English version) For some reason, my Japanese version flimographer forgot to film the Japanese version, so no title screen comparison yet
--the Marill sprite looks happier and sounds different in the Japanese version