How Green Was My Valley is as much a story of studio thinking as it is of Welsh miners. Originally, William Wyler was attached and even selected young Roddy McDowall from a screen test; but Fox ultimately handed the project to John Ford, a change that reflected the studio's executive maneuvering during the studio era. Fox also wanted to shoot on location in Wales in Technicolor, but the demands and restrictions of World War II made that impossible; the studio instead greenlit one of the most lavish constructed towns of the period—an 80‑acre replica of a Welsh mining village built at Brent's Crags near Malibu. The finished product was carefully managed: Ford hired Rhys Williams as a Welsh dialect coach and had Williams record the older Huw narrator, only to have the narration re‑dubbed at the last minute by Irving Pichel because Ford feared audiences would recognize Williams' voice from his onscreen role and be confused. Williams' narration persisted in some prints (including the original British release), which left the film with competing versions and exemplified the heavy hand of director and studio in shaping what the public finally saw and heard.
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