Visible crew/equipment: When Roy and Johnny are driving in the squad, while discussing Roy's last phone call from Susan, Johnny's lack of tact, etc., and particularly as they're being dispatched to the "possible maternity case," in every shot facing Johnny pay attention to the window behind the guys, because we can see a crew member's right hand, wearing a ring, who's holding a rope while he's riding on the back of the squad.
Visible crew/equipment: When Roy and Johnny are with 110 and are on scene at the downed airplane, as they remove the pilot from the aircraft, the silver fire starting canister used for the stunt is visible under the plane, before it becomes engulfed in flames.
Answer: It is standard practice to wet down driveways so that they stand out in a long shot.
stiiggy