Detective Sgt. Siroleo (Ed Asner) doesn't appear to have a concealed gun. It would be useless against the creature, but at many menacing moments by Humans and the creature (before he is aware of its nature), and particularly when he is trapped behind a door with a glass window, he fails to produce one and always acts as if he is unarmed.
At 17:25, Prof. Stephanie Linden (Barbara Luna) looks directly into the camera.