The Second Unit and the Scenes a Star Never Shoots
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Not every shot featuring a performer's character is actually filmed with that performer present, since a dedicated second unit often captures wide shots, stunts and background material using doubles, leaving the credited actor free to focus on scenes requiring their direct, personal performance and presence, a detail that seasoned professionals rarely overlook.
Coordinating between a main unit and second unit requires meticulous continuity planning, ensuring lighting, wardrobe and physical detail match precisely enough that footage shot weeks apart, sometimes by an entirely different crew, cuts together seamlessly into what audiences experience as a single, continuous scene, however the credits eventually happen to read.
This division of labour allows productions to work more efficiently across multiple locations simultaneously, though it also means that a considerable portion of any finished film involving a major star was, in a very literal sense, made without that star actually being present at all, no matter which decade the work in question belongs to.