At about 1 hr 10 minutes Ed is leaving the living room and walks by the phone base mounted on the wall. The headset, which Lyla had unsuccessfully tried to use earlier, in not there.
About 2 minutes later when Smith walks into the living room, he passes the phone and the headset is in place on the phone base.
In the opening scene, the character uses a bolt action rifle but then fires it repeatedly without reloading.