Character mistake: When Brackett and Early are dealing with three squads at the base station at the same time, Squad 51 has two victims - father and son, Squad 18 has a pulmonary edema, and Squad 36 has only one bicycle rider with severe head injuries, because the second rider died, so the total is four out of five being dealt with. Back at the station, after Johnny asked Dixie about the condition of all the victims, he tells Roy that the father and son are both responding, so is Squad 18's pulmonary edema, and for Squad 36's bike accident, that "both" are coming out of the coma, which totals five victims. Then Roy responds, "Four saves out of five victims. That's pretty good." Johnny should not have said, "both" since it was just one rider.
Character mistake: Days after Drew's death (Roy and Johnny had two days off after Drew's death), during the meeting that Brackett has with the four paramedic units, one of 59's guys asks, "What do we do when we have this overload situation on the same frequency? Two squads, like 51 and us today?" The situation with the frequency did not happen "today" as he said, it happened at least three days prior.
Character mistake: In the morning, when Roy and Johnny are by the lockers, talking about what Johnny did on his days off, Roy tells Johnny, "I came on this morning, guys on A shift told me that they had a meeting with Brackett at Rampart yesterday." It could not have been "A shift" because Roy and Johnny work the squad for A shift, with Captain Stanley and the rest of the guys. And we know that Roy and Johnny didn't switch shifts with B or C, since the rest of A shift are there with them, working the engine that day.
Other mistake: When Johnny and Roy are at the construction site with the injured father and son, Rampart is also on the line with two other squads - Squad 18, treating a pulmonary edema, and Squad 36, treating a bike accident. When Marco and Chet carry up the stokes basket, we hear the dispatcher saying, "Engine 21 and Squad 18, heart case...," even though Squad 18 is already tied up with the pulmonary edema.
Continuity mistake: At the construction site, after the younger patient has been taken to the ambulance, when Roy tells Johnny that it was pretty good radio work, Johnny's holding his helmet, but in the next shot as Johnny stands up his helmet is gone, though there is a helmet near the drug box behind him.
Continuity mistake: When the guy (Michael Conrad) with the gunshot wound is being wheeled out of the treatment room there is nothing on his face, but in the shot from the hallway as they exit the room suddenly he has a tube inserted into his nostril with tape holding it in place.
Visible crew/equipment: When Johnny and Roy are leaning on the old fire engine talking about how it's not just some old car, and then when Johnny bends over and lays the mechanic's creeper on the ground, the outlines of the mic transmitter and wire are visible on the back of Johnny's shirt.
Other mistake: When the dispatcher drops tones for the structure fire, he calls on Station 51, Engine 27, Engine 32, and Truck 105. Once there, Captain Stanley tells the dispatcher to send a second alarm, then hear him call on Station 19, Truck 98, Truck 34, and Battalion 43. However, the only ones at the fire with 51 are Engine 9, Engine 17, Truck 17, and two men with helmets from 20, even though dispatch did not call on any of them, and of all the companies that were called to the fire, none were there, except for 51.
Other mistake: On the first run of the Ward LaFrance we hear the dispatcher say, "Wrecking yard fire," but subtitles read, "Working yard fire," and as soon as Engine 51 rolls up on scene Mike turns to Captain Stanley and asks, "Light water?" but subtitles read, "Do we got water?" Then we hear the dispatcher say, "Repair 3, call Station 8," but subtitles read "Return 3..."
Visible crew/equipment: During the structure fire, when Captain Stanley uses the HT and says "Engine 17, you can pump to Engine 51," in the next shot a second cameraman carrying a handheld camera can be seen between Engine 17 and Engine 9, as he's shooting footage. He's visible again three shots later, standing beside Engine 17, and once again right after they lower the ladder through the hole in the roof.
Other mistake: At the structure fire, Roy and Johnny rescue 17's Captain Harmell, as seen on his helmet after he fell through the roof, but when Truck 17 sends its snorkel to the roof, 51's Captain Stanley and Captain Watson, whose helmet also shows 17, both assist with the rescue of the other Captain of 17.
Continuity mistake: While Squad 51 is out on the run (quite literally) with the female OD, Johnny gets a cut on his elbow which he keeps fidgeting with even after it's bandaged. When Roy and Johnny get back to the station and see The Old Engine, Johnny's cut has vanished.
Continuity mistake: When Johnny starts chasing Harriet down the street, in Johnny's closeup when he passes the white house (right after the yellow house), there is a light colored wagon-style car parked in the driveway, but in shots from other angles there is a green 2-door parked in that driveway.