First scene tie in

So we've got the opening exposition, straight into the couple making out under a poncho liner, followed by homeboy's "Ah *beep* gotta go," and the girl looking pouty as he leaves, then...

We never see them again? After watching the entire movie, I couldn't figure out if I was stoned or not, let alone what the creative team did with these two. Did they address it, or is it in one of these improbable sequels?