Crew or equipment visible: At the end of the movie, the tunnel system collapses and the buildings start to topple over. In several shots the cables used to pull over various buildings are clearly apparent, even though it appears that attempts were made to camouflage them with pennants. What gives it away is that the 'pennants' (until the buildings they are attached to topple over) are clearly under far too much strain to be merely hung as decorations.
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