This study was conducted to understand the mechanisms underlying the formation of entertainment content production networks and to facilitate understanding of the role dynamics that occur within them. In a prior study (2003), the researchers argued that role dynamics can emerge due to changes in the external environment, and through empirical analysis of films produced between 1991 and 2000, they concluded that during periods of rapid environmental change, networks that experienced role dynamics achieved better performance than those that did not. In the same vein as this prior research, the present study analyzed the degree of intensification of role dynamics occurring in film production networks under conditions where structural changes in the external environment had become generalized, using films produced between 2001 and 2006. The study empirically re-examined how such role dynamics affect the performance of network organizations, and further empirically verified whether these role dynamics remain valid even under specific environmental constraints (i.e., major distributors' investment in film production), thereby advancing the claims made in the prior research.