When Sony Pictures Classics releases "The Imaginarium of Dr. Parnassus" next month, viewers will be treated to a full-blown tour inside the head of helmer Terry Gilliam, courtesy of a mind-blowing blend of miniatures, motion control, bluescreen work and vfx.

What they'll barely glimpse is the thicket of obstacles -- technical and human -- that stood in the way of the film's completion.

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