I find it interesting that most people think it has a sad ending, that the "other" world wasn't real, it is definitely up in the air and you can take from it what you will, but I remember thinking that there weren't any implausibilities during the transitions from and to both worlds, nothing really clashes, so the director wanted the audience to make up their minds.
I did find the Spanish annoying, but it is because I'm not accustomed to 1940's castilian.
well, the realness of the other world is up for debate. i personally thought it clearly existed, but then i was not so sure....i guess that is the element of "fantasy" to it.
but the birthmark on her shoulder is real, the mandrake under the bed is real, and it makes the mom better (or, did the doctor do it with his medicines?)
the Labyrinth itself is definitely real...
but i think this it what makes the film so interesting.