With his start in melodrama acting and productions, William had an easier time transitioning to silent films because of his experience in emoting and giving gestures to audiences. His experience as an actor of many roles and characters allowed him to have a wide set of talents when it came to physical acting. As he began melodramatic acting in the 1880s, it helped teach Hart the art of emotions and theatrical productions. He learned how to give grand gestures and emotions in order to connect to audiences. As his acting portfolio grew, he also acted in classical productions, such as those of Shakespeare. By taking this route, he demonstrated a seriousness and dedication to his craft, as it helped him build his body language abilities and skills for successful acting. Right before the start of the 20th century, Hart began traveling with touring companies, further building his success and spreading his name across the nation.

By the start of the 20th century, film was on the rise and becoming just as popular as live theatre productions. A 1913 visit to Hollywood introduced Hart to this new world of cinema. As he saw these inaccurate and unrealistic western films, he decided to get involved and help honor the true western spirit. With the help of his theatrical acting experience, he had a better understanding of how to connect with audiences, even through a screen. From his theatre days, the exaggerated movements and actions allowed Hart to connect with audiences and tell a story without the usage of dialogue. With the help of his realistic costumes and plots, his films felt true and authentic. His Western childhood upbringing helped develop and evolve the stereotypical persona of a "cowboy" from one of a cowboy hat-wearing man to one that portrayed heroism and courageousness. One of Hart's major successes was his role in The Squaw Man (1914), a touring western melodrama where he starred as the cowboy. As he was exposed to the western film world, he realized his passion for the frontier spirit and helping bring that to film and audiences. His previous experiences of touring companies and classical theatre allowed him the ability to go onto a successful career, helping audiences learn of the true and authentic western lifestyle and culture. Through his determination and passion, William was able to shape peoples beliefs and interpretations of the frontier and western culture to a more realistic view.