Zack shoots several photos at the old crime scene. In some he holds the camera horizontally, others vertically. After each shot we are shown the viewfinder perspective, and the image is always for a camera held horizontally. This is clear from the split-image focus element; the center line is parallel to the base of the camera, and would be vertical when the camera is held vertically.
(at around 53 mins) you can see the boom mic operator's shadow in the glass of the picture hanging on the wall at the Judge's house.