Notice as Hunter and McCall are speaking about Sal Scarlatti, his white gloves are tucked in his belt but as he walks over to Claire Prossi, they disappear and then reappear when he & Claire join McCall.
Hunter and McCall were too far away from the building to have heard the gunshots that took place inside the building.
Both Hunter and McCall wear improper uniform insignia. McCall's chevrons indicate she is a Police Sergeant 1, while Hunter has an added single rocker under his chevrons indicating he is a Police Sergeant 2. Since both are detectives, each should have had a lozenge under the chevrons to denote that rank. McCall would be a Detective 2 and Hunter a Detective 3.