The story is obviously the most important part of a film adaptation. The plot should remain faithful to the original to stay true to the author's vision. While it is possible to make changes to dialogue, characters, and setting, the adaptation must convey original main events and message of the story.
Characters
The characters in a film adaptation should be true to their original counterparts and the story they inhabit. Their relationship with each other and the protagonist as well as with their environment must match the original story so that the viewer can engage with the story and characters in the same way as the reader.
Theme
The theme of the story should be present in the film adaptation. The author's message should be clear throughout the plot, and the viewer should be able to identify and understand the film's main idea or lesson.
Setting
The setting in a film adaptation can provide atmospheric tension, create a unique look and feel for the story, and give insight to the characters and cultures involved. While the setting may be changed from the original work to better suit filmmaking needs, it should capture the essence of the original setting and enhance the story.
Tone
The tone of a film adaptation is critical in portraying the intended emotion and mood of the original work. The tone of the film should match the tone of the short story and be maintained throughout the adaptation to stay consistent with the author's vision.