
There are two foreign language Easter Eggs in the game, both Dark Samus related. In the beginning, if you examine the life support system, the screen will fill with seemingly-random letters. It's actually French, though, and reads "Vous mourez si votre resistance est forte," which translates to "You die if your resistance is strong." Near the end of the game, you will also find some German text, which reads "Kampfen Gandrayada, die Zahl von einer falschen freund." This translates to "Fight Gandrayada, the figure of a false friend" (though the German is technically grammatically incorrect).
To quickly kill 1,000 enemies (and achieve the Friend Voucher easily), try using the Morph Ball. The bugs that grab onto you as you scale walls can be destroyed with the bombs from the Morph Ball. Doing this continuously for a little while will net you 1,000 kills rather easily.