In the same scene, as Mary prepares to leave the house, she simulates extinguishing the oil lamp on the table and the room gets noticeably darker, despite the setting being filmed outdoors. This effect was likely created by an assistant to the camera operator, who simply lowered a filter in front of the camera's lens.
In the same scene, as Mary prepares to leave the house, she pretends to extinguish the oil lamp on the table, and the room becomes darker despite being filmed outdoors. The darkened effect was likely achieved by a camera assistant who adjusted the camera lens with a filter.