"What Just Happened" is a 2008 comedy-drama directed by Barry Levinson, starring Robert De Niro as a Hollywood producer navigating the chaotic world of filmmaking. The film offers a satirical look at the entertainment industry, highlighting the challenges of creativity, public perception, and personal relationships. While some viewers appreciate its humor and insider perspective, others find it uneven and less engaging. Overall, it received mixed reviews from critics, making it a film that may appeal more to those interested in Hollywood's behind-the-scenes dynamics.

Yes, "What Just Happened" is based on a true story. The film, released in 2008 and directed by Barry Levinson, is adapted from producer Art Linson's memoir, which chronicles his experiences in Hollywood. It satirizes the film industry, focusing on the challenges and absurdities faced by a producer as he navigates the complexities of filmmaking, including dealing with temperamental stars and studio executives. Although the characters and events are fictionalized, they reflect real-life situations in Hollywood.

The movie "What Just Happened" is a satirical comedy that explores the ups and downs of Hollywood filmmaking. However, regarding the most-watched movie of all time, it is generally considered that "Avatar" (2009) holds that title based on box office gross and viewership metrics, although "Titanic" (1997) also ranks highly. The measurement of "most watched" can vary depending on criteria like box office sales, home video sales, or streaming views.

Robert De Niro's first movie was "Greetings," released in 1968. Directed by Brian De Palma, it featured De Niro in a supporting role as a character named Larry. The film is a dark comedy that explores issues of draft dodging during the Vietnam War. De Niro's performance in "Greetings" marked the beginning of his illustrious career in film, leading to numerous iconic roles in the years that followed.