Continuity mistake: In nearly every episode, the dark blue jackets that Gage and DeSoto wear suddenly appear and/or vanish and then reappear, numerous times, while en route in their squad, or when they pull into the stationhouse and Rampart. Since stock footage is usually used when showing all the guys getting into their vehicles, Johnny's hair length may differ as well.
Loose Ends - S6-E12
Visible crew/equipment: When the guys bring Brackett to the hospital after his car accident, two white tape, and one black tape actors' T-marks are all visible on the floor in the ER.
Peace Pipe - S2-E5
Visible crew/equipment: Just after the drunk driver is loaded onto the ambulance, when Roy tells Johnny about Debbie's pulse and respiration, and that she's in bad shape, then also when Roy tells Captain Stanley to make it quick, a crew member sitting atop a ladder with set lighting beside him are visible in the background.
Fair Fight - S6-E5
Visible crew/equipment: After the cave-in rescue, when Dixie, DeSoto and Gage are in the ER, Gage washes his face and as he comments that he wasn't cut out to be a mole, two tape marks are visible at his feet.
Visible crew/equipment: When Mr. Grady (self-defense instructor) is in the ER, being examined by Dr. Brackett, there is a visible T-mark on the floor behind Gage.
Visible crew/equipment: After Chet is brought to the ER, Gage goes to the nurses' station. When Brackett opens the door and walks out of the base station booth, the actor's T-mark is visible on the floor behind him.
Visible crew/equipment: When Brackett's helicopter takes off the filming helicopter can be seen through the window. (00:03:45)
Continuity mistake: When Roy and Johnny are on the roof with Harriet, we can see the shadow being cast by the utility pole on the street down below, and when the police car shows up moments later that shadow has changed significantly. (00:12:40)
Continuity mistake: After Johnny and Roy bring the injured fireman to the ER, Emma walks up to them in the hallway to ask why they haven't put out the fire yet, and the large handbag hanging from her left arm is suddenly on her right arm when it cuts to the close-up.
Continuity mistake: At the restaurant, when they begin to work on getting Mrs. Merkle out from under the car, Vince sets the Biophone down on the table, and there's a netted, red glass candle on the table, but in a following closeup the candle's net has vanished and it's pinkish clear glass now. Other items on the table change as well.
Continuity mistake: When Brackett tells Dixie about the visiting administrators she's holding a clipboard, but when she's stopped by the man whose son has an arm injury, Dixie's now holding a brown folder.
Revealing mistake: During the rescue at the jail, while Roy tries to get a safety belt around the prisoner's waist, the man freaks out, then grabs Roy and they both swing out on Roy's safety line. When the camera pans a bit too far to the left, we can see the edge of the fake "sky" screen on the left, behind the building's replica set used for closeups.
Continuity mistake: While Brackett is with Ken in the ER he's wearing a blue/white striped tie, and when he calls Ken's doctor the tie is tied differently, but then it's tied the original way.
Continuity mistake: After Johnny and the attendants exit the ambulance with Dora, the pregnant woman, the ambulance is empty and the drug box is on the seat with the Biophone on the floor beside the seat, but in the next shot as the gurney is wheeled inside, the drug box is now on the floor between the Biophone and seat.
Continuity mistake: When Roy and John are at the inexperienced cook's apartment the second time, when her fingers are caught in the mixer, she's wearing a blue/white striped dress and a watch on her left wrist, but in the closeup as she reaches for the boiling pot her watch is gone and it's a white sleeve on her arm.
Continuity mistake: When 51's guys go down into the tank to try and subdue Al, the big guy who has a chemically induced psychosis, the ring Al was wearing on his left hand in the overhead shots is gone, but when Al shakes Chet upside-down in the closeups the large ring is back, but then it vanishes again.
Continuity mistake: During the structure fire, after the parents realize their son ran back into the burning house to get the dog, when the father tries to go after the boy we can see the man's wearing a striped T-shirt under his robe, but when Roy rescues both the boy and the dog, the father is now wearing a white T-shirt under the robe.
Continuity mistake: After 51's guys rescue the man from under the fallen engine, when the ambulance leaves we can see only the name Mayfair is printed on its side, but en route to Rampart and when Roy has the ambulance stop and then go, there's a red cross printed on the surface above Mayfair.
Continuity mistake: After Johnny and Roy find the motorcycle and its injured rider, Johnny wraps his arm/shoulder area, but the way it's wrapped - whether or not it's over the shoulder and/or at his waist, and the amount that's wound around his body, significantly differs between shots until they see Vince at the base station.
Visible crew/equipment: After John and Roy rescue the elderly man from the burning house, while Roy gets the man's vitals in the closeups, the large 12-light par bank rig is visible behind Roy at the left of the screen.
Answer: It is standard practice to wet down driveways so that they stand out in a long shot.
stiiggy