Shadow outside shower when karen is bathing.
Spoilers
The director in the commentary said that this was something significant. Evedently because of the cut on her neck that is evident that actually happens later in the movie, this takes after all the other events of the movie. The shadow appears sort of curved and hunched over like one of the demons. But, my take on the movie is that the demons were caused by a drug in the muffins so i don't know what to make of it exept it could be a lingering flashback from the drug or ptsd. The blond haired girl also freaked and saw demons when she left her boyfriend and the freak tied up right after she splashed water in her face. Could there be something in the water? I doubt it but it's the only theory i could come up with.
Anyone?