On the Road Reviews
From the first line (the first line!) they change the plot by the narrator (Sal/Kerouac) saying, "I first met Dean not long after my father died." The book, on the other hand, says, "I first met Dean not long after my wife and I split up." And this divergence from the true author's plot is repeated later in the film when we see Sal typing the book on a scroll he created and it is the wrong (the movie) version.
Why would they do such a thing? I can only conclude that it is to support the other changes they have made to the plot. The film that follows is full of gay activity, not just surrounding Carlo who is gay in the book, (and who represents Allen Ginsberg, whom we know to be gay), but between Dean and Sal to a limited extent, and between Dean and Allen and others to a greater extent. It kind of seemed like a soft gay porno at times. I recommend reading the book instead.