Deliberate mistake: During the rescue of the car at the top of the draw bridge, The Boat approaches and radios in to say that they have a diver standing by. Then after Johnny shouts, "Are you all right?" the rescue boat is shown again, but this time it's a flipped shot - note that everything is reversed from the prior shot.
Continuity mistake: When Squad 51 and the ambulance arrive at Rampart with the father and unconscious diabetic son, the type of ambulance that backs up to the ER entrance is a station wagon, but in the interior shot from Rampart the ambulance type is a truck.
Visible crew/equipment: When Johnny and Roy are at the home of the pregnant woman who was shot, the bulging outline of the mic transmitter is visible on the back, left side of Johnny's shirt.
Daisy's Pick Blind Date - S4-E7
Visible crew/equipment: When the unconscious little boy is loaded into the ambulance, we see the actors' chalk x marks on the ground, where Roy, the boy's father, and mother are all standing.
Visible crew/equipment: After Cora is rescued from the cactus patch, when Harry annoys her and tells her to keep a stiff upper lip while she's lying on the gurney, the reflections of crew members and two reflector screens are visible on Harry's red bike helmet.
Visible crew/equipment: When Johnny and Roy help Cora crawl along the ladder from the cactus patch located in a secluded area, just as Johnny tells her to take it nice and slow, the camera moves a bit too far to the left and then shifts back to the right, but not before we are able to see a crew member, equipment and a large patio-style umbrella.
Visible crew/equipment: When Roy treks across the ladder to get to the woman in the cactus patch, the outlines of the lav mic transmitter and wire are visible at the back, right side of Roy's shirt. Then, when Johnny's on the Biophone with Rampart, the outline of the mic transmitter is visible at the back, left side of Johnny's shirt.
Visible crew/equipment: At the liquor store shooting site, when the second gurney is loaded into the ambulance, the outlines of the mic transmitter and wire are visible on the back, left side of Johnny's shirt.
Visible crew/equipment: After the sniper surrenders, Captain Stanley instructs Engines 12 and 51 to come to the rear of the building, and a few shots later the camera moves alongside Engine 12 as it's turning the corner. In this specific shot, up ahead we are able to see set lighting (including moleeno-style array lights), equipment, crew and actors (in the blue paramedic uniforms), some sitting on chairs in front of the parking attendant's booth (which was shot at by the sniper during the scene).
Continuity mistake: When Johnny and Roy are treating the officer, while hiding between the bakery truck and car, the sniper fires at them which leaves multiple bullet holes on the side of the truck. However, when Vince talks to the Sergeant on the handie-talkie and then fires the tear gas, all the bullet holes on the truck are gone, but they soon reappear.
Visible crew/equipment: After the police officer is shot by the sniper, when Roy and Johnny run with their equipment and duck down behind the squad car, the outlines of the mic transmitter and wire are visible on the back of the Sergeant's shirt, as Johnny and Roy are given flak vests.
Continuity mistake: The window from which the sniper is firing sustains damage with broken glass panes, but then the glass panes are whole and intact, and then they are broken again.
Visible crew/equipment: When Roy and Johnny are with the sick dancer at the bar, the outlines of the mic transmitter and wire are visible on the back of Roy's shirt.
Visible crew/equipment: When Station 51 responds to the photographer who fell in the lion's pit, the outlines of the lav mic transmitters and wires are visible on the backs of Johnny's and Roy's shirts.
Visible crew/equipment: After Art tells Johnny that a film about paramedics is passé, but he'll invite him to the doll movie premiere, Johnny walks over to the ambulance, and the outline of the mic transmitter is visible on the back of Roy's shirt, at his right.
Visible crew/equipment: When Engine 51 arrives at the toy factory fire and comes to a full stop, we see the hunched over cameraman holding a handheld camera, with another crew member standing right behind him, and just as Captain Stanley opens the door and emerges, we see the cameraman being helped up and both men turning and moving quickly to their left, as Captain Stanley jumps off the engine.
Other mistake: When the deaf woman is delivering a baby, the subtitles read that Johnny is saying, "The head is rotating," when in fact it's Roy saying that. Subtitles from Universal Studios 2010 DVD.
Other mistake: At the scene of the vehicle accident, with a raging fire going on, the Chief communicates over the HT with Copter 10, and when Copter 10 arrives and makes the water drop, it is actually Copter 14 we see in all the shots.
Continuity mistake: When Dixie goes to the waiting room to get Pete Barlowe so she can bring him to see Brackett, we see Carol, the nurse with black hair, working behind the admitting desk, but in the next shot Carol is in the treatment room with Brackett and Pete's wife.
Revealing mistake: When Station 51 is dispatched to the bomb threat, just as they roll up on scene, in this specific POV the corner edges of the screen are blacked out due to the lens that was used, but when it cuts to other angles it's gone, then it reappears with that POV. We see it three times.
Answer: It is standard practice to wet down driveways so that they stand out in a long shot.
stiiggy