Movie directors discovered that they can film different parts of the same scene on different days, and most viewers would not detect that the extras (background actors) had changed clothes or appearance. Psychologists call this failure to notice such differences

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Change blindness refers to the inability to detect changes in a scene, especially when the changes occur gradually or when attention is focused on other aspects of the scene. In this case, viewers fail to notice changes in the appearance of extras because they are not paying attention to them, and their attention is focused on other aspects of the scene.

Movie Directors Discovered That They Can Film Different Parts of the Same