Characters must never be random. If you must introduce a character or exit one, ensure it is for a purpose and must move the story one step ahead.
Dialogue should be used only when necessary. A film should favour the “deaf” more than it favours the “blind”. Utilize economy of words. Show, rather than tell
Subtext is essential. The lines between the lines. The unsaid meaning in a dialogue. It keeps the audience guessing.
Suspense is critical. You can achieve that with subtext. Ensure you keep your audience on the edge. Use a split mechanism to achieve that. Direct them to one side and turn up on the other though not arbitrarily.
Pace is also very important. Although it is largely dependent on the directors but to help them, remove every scene that your script can deal without. If you are done with a script, look at those scenes that if you delete, it won’t affect your story, delete them. It adds pace.
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