As it was explained after the airing, the Titans creative team had initially planned for a far different conclusion, in which the villainous demon (and Raven’s father) Trigon would be more properly introduced.
More than just Superboy’s arrival confused fans about that finale, considering only a few minutes took place within the real world.
So now, we can at least hope that Superboy has something to do with that introduction.
They decided to hold that back for the Season 2 premiere, however.