In the book, we read as Katniss fights her way through the Hunger Games. We watch as she volunteers for the games themselves and as she prepares for them, with the help of Haymitch and her stylist Cinna (Lenny Kravitz). Once she is in the games, however, the focus is on her survival.
But in the movie, many of the backstage machinations are revealed. Viewers watch as the producers of the game invent ways to keep the tributes close to each other. In this regard, President Snow (Donald Sutherland) plays a much bigger role in the film, where he appears in several scenes discussing the games with Seneca. The film shows in some detail how much work is involved backstage in getting the games to play out in an entertaining and engaging fashion.