When Chris visits the police officers outside Jean's house, the male officer is seen talking to Chris and then in the next shot his finger is up in a split second.
A majority of the cast notice the camera is filming them e.g. The female bully walks past the camera and spots it. Also Jean notices the camera is still filming her therefore breaking the forth wall.
At the beginning Chris mentions that his third caller is the most intelligent caller of the night. He hasn't even spoken to her at this point.