When the rapes are finally over and Jennifer manages to get up, she is filthy and covered in leaves. Later, after she has walked away and is staggering through the woods towards the bridge, we see that she is practically clean.
When Jennifer is trying to get the wine out of her sweater, she is furiously scrubbing it. However, when the scene switches and we see her through the lens of the voyeur's video camera, her arms are barely moving.
When Jennifer is freaked out by sounds in front of her cabin, she goes outside to take a look. When she comes back in, she locks the cabin door and starts walking towards the stairs/living room. The faint reflection of camera/crew can be seen in window in the background.