The police chief towards the end pulls apart the tape evidence dropping it into a trash can. The film clearly does not cover whether Rebecca, Michael or Paul were killed in the storyline. Thus leaving open for a possible sequel.
A shadow of the camera is clearly visible during the standoff between Josh and Michael.
A spotlight is clearly visible as Michael takes off with the illuminant figures trailing behind the vehicle.
Towards the climax. Rebecca is seen in what appears to be a different dimension with scratches on her face. When she goes back into reality, the scratches disappear.