Other mistake: At the start of this episode Squad 51 heads out to the construction site with the screaming woman, and Roy and John are in their full turnout gear, which means they've just spent the night at the station and it's early morning at the end of their 24-hr shift, yet back at the station Roy and John are getting into their uniform at the start of their shift, which is 8:00AM. Joanne Worley's screaming segment was filmed for an earlier episode, but was inserted into this episode.
Other mistake: On site with the boy on the ledge, when Truck 85 raises the aerial ladder Roy stands by and waits to go up with Johnny behind him. Both Roy and Johnny are the only ones not wearing their turnouts, and both of their watches are on their left wrists, but when 85's aerial apparatus operator says "Desoto, up the aerial," the bare arm we see beside him is wearing the watch on his right wrist. This is not a flipped shot.
Other mistake: When Roy and John are examining the boy who jumped from the ledge, they're standing at the back of Engine 85 while the boy's sitting on the tailboard, and we can see behind his head the vinyl material with the imprinted 85, covering the attached plate with the real company number.
Other mistake: When Tommy is in the treatment room drinking chocolate milk, the container of milk has tape wrapped around it, so the brand name would not be visible. Later at the station, when Chet is polishing the table in the kitchen, the spray can he's using has tape wrapped around it as well, for the same reason.
The Promise - S3-E11
Other mistake: Richard is in room 603 and jumps out of the 6th floor hallway window. In the long shot of the exterior of the building, we see that he's lying on the ledge of the row of windows that are second from the top. The elevator shows 8 floors, which means that he's actually lying on the 7th floor's window ledge.
The Promise - S3-E11
Other mistake: At the very end, when Roy is cleaning the windshield while John's fiddling with the squad’s radio mic, the spray can on the hood of the squad has tape covering the brand name.
The Promise - S3-E11
Other mistake: When Johnny and Roy get back to the station, Chet tells Johnny that Paula's going to come by around 12:30 PM, then when the dispatcher sends Squad 51 on the 'woman down' run he says "Time out 12:22." When the guys get back to the station again, Paula tells Johnny that she arrived around noon and that Engine 51 left on a run shortly after.
Other mistake: When they're trying to identify the address of the attempted suicide, Engine 51 stops and is standing by at 223 Street and Ridgely, while the squad drives elsewhere, and when Squad 51 stops it's standing by at 218 Street and Carson. However, when they're dispatched we see that the rigs are actually pulling away from the same corner but facing opposite directions, note the area and background. Then when Johnny and Roy put on their turnouts, in the next shot of Engine 51 it's now driving towards the camera in the opposite direction on the same street they had pulled away from.
Other mistake: When Dixie's on the phone with the suicide attempt, Dixie tells her the date of her own birthday, hoping to get the caller's birthday in return. Then when the caller tells Dixie that the month of her birth is February, while Brackett's listening, they don't contact Early who's with the senior data analyst with that crucial information to help narrow down her identity faster, which was the whole point of Dixie trying to get that information from her.
Other mistake: During the fire at the horse ranch, when Engine 40 rolls up we can see that the engine company's number is covered atop the cab, and the large, red rectangular vinyl material that's adhered to the back of the engine with nothing on it. Presumably covering the real engine company's number.
Other mistake: When the dispatcher sends Squad 51 to the heart attack at the bank robbery location, the address is given as "2057 North Hillcrest, cross street Barker," but when they arrive at the corner bank, the sign reads Celis Street.
Other mistake: When Station 51 is dispatched to the woman who fell through the ground into the abandoned well in her backyard, en route there's a moving bird's-eye view as the filming chopper follows 51's vehicles making a right turn. On the ground below, there are two people standing beside a blue station wagon, and one points up to the filming chopper flying overhead.
Other mistake: When the dispatcher sends Station 51 to 26309 Barcelona Drive, as the squad pulls up in front of the house, the number on the mailbox post reads 4050.
Other mistake: At the end of the episode, when Roy, Johnny, and Chet are at their lockers, Roy comments that Gloria won't make the same mistake twice about the $8.42, and Chet laughs, but the subtitles read, "Marco laughing", even though Marco is not in the scene. Subtitles from Universal Studios 2010 DVD.
Other mistake: While John is searching through the papers for the receipt, when Roy takes the milk carton out of the fridge he pours some into a glass and some ends up spilling onto the floor, we can see there's black tape on the milk carton covering the brand name.
Other mistake: When the squad and engine roll up on the scene of the bulldozer accident in the junkyard, just as the guy runs up to inform them about the victims, have a look at Squad 51's license plate number because it is not the normal prop plate number E999007.
Other mistake: After Johnny gets hit by the phantom in the apparatus bay, Station 51 is dispatched to an unknown type rescue at 617-1/2 Kimball Rd, and before the dispatcher even gives the address, Mike has already located the area on the map with his finger.
Other mistake: When Squad 51 is dispatched to "possible heart attack" the address is "91st and Formosa" (the 'Black Tower' can be see behind the Chevron sign when the squad rolls up), and later when they're dispatched to "person caught in mailbox" the address is "Beverly Blvd and Main." What's funny is that the two incident scenes are filmed at the same corner of the intersection, with Universal's 'Black Tower' nearby. Have a look.
Other mistake: When Roy and Johnny are working on the squad's engine, while Johnny's lying on the mechanic's creeper, Roy is holding a spray can with white tape wrapped around the top of the can, so the brand name would not be visible.
How Green Was My Thumb? - S3-E17
Other mistake: When Johnny and Roy take the elevator with the nurse, they take the elevator near the nurses' station, at the south end of the ER wing, and Johnny follows the nurse onto the 4th floor to try and get her name. This is completely impossible considering the actual floor plan of the hospital, since in all of the exterior shots of the ER it's only 2 storeys.
Answer: It is standard practice to wet down driveways so that they stand out in a long shot.
stiiggy