Prior to visiting lawyer's office, Rosa wipes off all her make-up, then is seen wearing bright lipstick during a close-up in waiting room, which immediately disappears for rest of scene.
Near the end, as Rosa prepares to catch the Chicago train, the camera dollies backwards, away from her, and as it does, the equipment bangs into her closet door, causing the clothes hanging on it to sway back-and-forth.
At 28 minutes when Rosa is at the railway station, shadows on the ground show that extra lighting is being used to illuminate Rosa while she is walking in the shade of the overhanging tree.
The film is set in Wisconsin, but when Lewis and Rosa are driving back from the attorney's office, their car is seen passing along a winding mountain road with a high rock face to one side and a deep ravine on the other, but Wisconsin is quite flat with fairly low rolling hills.
At the start of the film, the narrator says that Rosa's house is the farthest away from the sawmill, but when Rosa is seen on her house's veranda, there are no buildings between her house and the sawmill.