Visible crew/equipment: After Station 51 is dispatched to the possible heart attack, when they arrive at the scene it cuts to the interior shot of the pregnant woman walking to the door, and we can see the shadow of the cameraman moving across the lamp and curtains.
Visible crew/equipment: When the guys are looking at the vitamins that Chet brought for them 51's tones drop, and as they leave the kitchen the two actors' T-marks are visible on the floor where Mike and Marco had been standing.
Visible crew/equipment: After Captain Stanley tells the guys about the doctor who's doing the diet/nutrition study, when they leave to check the new refinery hydrants, the actor's T-mark is visible on the floor where DeSoto had been standing. Also note that DeSoto is wearing slippers when he stands up. It happens again later, he's wearing slippers with no socks when Morton is talking to the guys about stress and diet.
Visible crew/equipment: When Johnny tells dispatch to respond Engine 51 to Oceanland Park, as Engine 51 pulls away from the curb, the shadow of production equipment is visible on the engine's surface and the street.
Visible crew/equipment: When Station 51 is dispatched to the possible heart attack, just as Squad 51 is leaving the apparatus bay and passing the exterior glass doors to Captain Stanley's office, the reflection of the location's array lighting is visible on the glass doors.
Visible crew/equipment: When the dispatcher drops tones for the 'possible heart attack', just as we hear Captain Stanley respond, "KMG365," we can see movement between Engine 51's front driver and passenger seats, where the camera is located. Captain Stanley is still at the radio base station and Mike hasn't opened the door yet.
Visible crew/equipment: When Roy leans over Captain Stanley after he was electrocuted, the outline of Roy's mic transmitter is visible on the back of his shirt.
Answer: It is standard practice to wet down driveways so that they stand out in a long shot.
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