In the movie, [fill in scene details] happened. Did that really happen in Jim Carrolls life?
In short, no. I’d say the overall story sort of reflects something like what happened in Jim Carroll’s life, but you’ve got to read the book. For details on the film, check out the Basketball Diaries film section of the website, which offers a scene-by-scene guide comparing the film to the book, as well as reviews and commentary.