The movie has to condense a lot of story elements to fit within a certain time frame. So some sub - plots might be cut or simplified. In the Spider - Man 2002 novel, there could be more sub - plots and side stories. For example, there might be more about Peter Parker's life at school, his relationships with other students that are not as prominent in the movie. The movie also uses special effects to bring the action to life, like the fight scenes between Spider - Man and his enemies. In the novel, these scenes are described through words, which can give a different kind of vividness to the reader who uses their imagination more.
Well, in the movie, the characters' appearances are very distinct. But in the novel, the author might have more freedom to describe their personalities in a more in - depth way. For instance, the Green Goblin in the movie is visually menacing. In the novel, we might get more of his backstory and motives through text descriptions. Also, the pacing in the movie is set by the visual cuts and action sequences, while the novel can have a different pacing depending on how the story is written and the paragraphs are structured.