After the second world war, the industry was broken into small fragments, each specializing on particular tasks within the division of labor required to produce and show a finished piece of filmed entertainment.
Stability and standardized products more typically engender integration, as it provides the benefits of scale economies.
Economic geographers typically differentiate between knowledge-intensive, volatile, unstandardized activities, and standardized, routinized production.
The former tend to be clustered in space, as they require proximity to build a common conceptual framework and share new ideas.
Even in those industries however, design and other creative and non-repetitive tasks tend to exhibit some geographical clustering.