The first documentary films about the entertainment industry date back to the 1920s, with films such as "The Hollywood Reporter" (1929) and "Behind the Scenes" (1928). These early documentaries provided a glimpse into the lives of Hollywood stars and the filmmaking process. Over the years, the genre has evolved, with documentaries such as "The Celluloid Closet" (1995), "Lost in La Mancha" (2002), and "Jodorowsky's Dune" (2013) offering in-depth looks at specific aspects of the industry.