What is a “supportive detail”?
Successful papers almost always include detailed support for focused claims. Broad, sweeping claims, like “that is a terrible movie” are not as persuasive as more specific claims like “the plot of that movie was so bad even the actors were bored.” To support either claim, you need specific details. For example, instead of just saying that the actors were bored, you need to show their boredom like this: “At what is supposed to be the dramatic climax of the movie, when the hero is battling the villain, you can see a woman in the background yawning while another character is looking at the horses rather than at the “drama” in front of him.”