This article explores academic and industry perspectives on the use of dialect, slang, and historical language in screenwriting. It offers a chronological overview of major screenwriting manuals' treatment of dialect and slang (or lack thereof) 1946-2020. It then presents survey data of 53 currently-practicing screenwriters' views on working with dialect and historical language in scripts, as well as their sense of possible changes in the industry regarding attitudes towards diverse voice representation on the page. It concludes with examples from a teaching sequence that illustrates strategies for writing with dialect, researching it, and ethically considering its usage in scripts. Situating this work as an important intervention in historical English language studies as well as writing across the curriculum/writing in the disciplines, the article advocates for a focus on teaching concrete, actionable steps that align academic practices with industry norms. It also encourages students to critically engage with those practices and norms.