Lorelai and Max are walking around Stars Hallow on a snowy night. When they arrive at Lorelai's house, they stand on her front porch and talk. The camera is positioned where you can see the back of Lorelai's head, which has no snowflakes on it at all. Then the camera switches around so you can see her face. When it switches to the back of her head again, there are suddenly three distict snowflakes arranged in a line across the back of her hair. The camera switches from her face to the back of her head repeatedly, each time with either no snowflakes or three prefectly aligned. This is pretty noticable, actually.