There's simply a few moments in the games where the choices made (or the password found or not) are changing the course of the story.
Spoiler :
Additionnally, there's 2 of the 6 routes where events are solving themselves regardless of the password failed or not, preventing some ending to be reached on thoses 2 routes.
I assume you started with Sal ? Since path G is the one you're fuzzing about and not one of the previous letter path ^^"
If so, expect a bit of changes by failing a certain password at some point when running another route. If not, my apologize.