When Ruth is talking to her sister Terry, who is in bed, the mirror shows a reflection of her sister with a picture above her bed. When you look at a straight shot before and after you can see that there is just a wallpapered wall behind her. Later on in the movie, you are able to see a picture above Terry's bed and Ruth's bed, this time correctly matching the mirror.
The daytime overhead general shot of the police car arriving at the Medical Building with the witnesses gives the pedestrians opposite shadows to those of the vehicles. In the following mid shots the direction of light has changed again.