To ensure that his script adheres to fair use principles, Dell should shorten the direct quote material to a few sentences. This approach minimizes the amount of copyrighted text he uses while still providing the context necessary for his audience. Additionally, he should ensure that his use of the excerpt serves a transformative purpose, such as commentary, criticism, or education, which are key factors in evaluating fair use. It's also beneficial to provide proper attribution and context to support his transformative commentary.
While paraphrasing could reduce the risk of copyright infringement, it may not provide the same immediate connection and impact as a direct quote. Placing the citation at the end of the podcast is not sufficient, given that attribution should accompany the quoted material. Seeking permission from the author, although not always necessary for fair use, is typically a more cautious approach but may not strictly adhere to fair use principles if the amount used is reasonable. Therefore, the most immediate adjustment would be to shorten the quoted content.