No that was a explanation on the fly that the kid (i forget his name) borrowed from warcraft and nobody bought it. They just moved on without expanding on it, like it didn't matter.... cause it didn't really at the time.
But the whole idea of another dimension and other life forms and stuff shouldve been explored more and how the gate got open, exactly what is the "upside down", who created it, where is it and what is a metaphor for, what happens when people get trapped there.....
and the scientists experiments and all the kids they tested and alternate reality stuff, how does it continue to tie into the story. they couldve got into all that more.