In a scene near the beginning Donna (Mastrantonio) and Joe (Straithairn) are riding in his truck. Donna's cigarette smoke is blowing away behind her and in close-up her hair is moving, but throughout the scene you can see the windows are obviously both closed.
On some occasions when Noelle is reading from the diary in the cabin, she's sitting with her back to the fireplace. Since the fire is the only source of light at night, that would put the diary in shadow and make it unreadable.