Visible crew/equipment: When Station 51 is dispatched to the movie studio, during the rescue of the injured stunt guys, the bulging outlines of the mic transmitters and wires are visible on either the backs or sides of Chet's, Roy's, and Johnny's shirts.
Visible crew/equipment: When the deputy arrives at the scene of the overturned tractor, the reflection of set equipment is visible at the hood of his vehicle, over the tire.
Visible crew/equipment: When Roy and Johnny are treating the man under the tractor, and subsequently Dr. Knott, the outlines of the mic transmitter and wire are visible on the back of Johnny's shirt.
Visible crew/equipment: At the nurses' station, Early asks Dixie about Carol, and when Dr. Knott pulls away in the wheelchair to go get Carol, the actor's tape mark on the floor is visible, precisely where Brackett had been standing moments ago.
Visible crew/equipment: When Squad 51 is dispatched to a drowning, just as Chet tells Johnny, "Don't go getting yourself damaged," the set lighting is reflected in the squad's spotlights.
Visible crew/equipment: When Johnny walks out of the ER, and finds out from Sally that Roy's been spreading advanced publicity about Johnny's 'modeling career', and then when Dr. Knott joins them, the outline of the mic transmitter is visible on the back of Roy's shirt.
Visible crew/equipment: When Dr. Knott comes back to the ER to see the tractor driver before he's discharged, he walks down the hallway with the nurse, and when he stops near Brackett he looks down at the actor's tape mark on the floor, then steps up to his mark. Then after Dr. Knott experiences chest pains, the two actor's marks in the two spots where Brackett had been standing, are visible on the floor as they walk to the treatment room.
Answer: It is standard practice to wet down driveways so that they stand out in a long shot.
stiiggy