Actually that spit-rotation shot was something they had to cut away from early, because the rig wouldn't sustain the weight of the model through the full amount of rotation.
That's fascinating. I'd always thought it was an artistic decision.
During its theatrical run I was lucky enough to see it in a theater where the volume was turned up high (on premiere night) as well as a few weeks later at normal volume in a different theater. Some dialogue was obscured the first time around, but the orchestral WHAM
at the end of the opening-credits crescendo was much more thrilling, as were other moments later on.