Continuity mistake: At the start of shift, after Captain Stanley gives the guys assignments, when the last shift rolls up in the squad, in the closeups Roy is suddenly holding his helmet while he and Johnny are talking to Dwyer, but it's gone again in the wide shot. When the squad is dispatched, Roy grabs his helmet which had been lying on the engine's running board in all the wide shots.
It's How You Play the Game - S4-E19
Continuity mistake: While Johnny tells the other guys that the losers of the baseball game, between 51 and 36, will have to pay for the entire cost of the picnic, Chet's eating an apple which has less eaten by the time he tosses it into the garbage.
Continuity mistake: After the OD is dropped off and left at the ER, during her examination Brackett finds the marks on her foot, and in the closeup the marks have moved and are more pronounced than in the wide shots.
Transition - S4-E15
Continuity mistake: When Gil's in the basket ride at the amusement park, while Captain Stanley swings the line that Johnny's hanging on, in the closeups the open cage door is facing Johnny, but in the long shot looking up the basket's open door is on the opposite side, and Johnny would not have been able to enter it as easily.
Transition - S4-E15
Continuity mistake: When Roy walks into the ER with the chemical burn patient they rescued from a kitchen filled with hydrogen sulfide, Dixie tells them treatment 1 which has a windowless door, but in the shot from inside the room the door has a window, and we can tell it's treatment 3 they're in.
Transition - S4-E15
Continuity mistake: After Brackett and Johnny try to convince Gil that he's not responsible for the MI patient's death, when Johnny walks out of the treatment room he says he's going to check on Roy, and as he opens the door we can tell that he's in the room across from the nurses' station. Then when he and Roy leave the treatment room where Early had examined Roy, we can see that it's the very same treatment room that Johnny had just been in with Brackett.
Continuity mistake: When Dixie tells Roy and John that Vic wants to see them the guys walk into treatment 2, but in the shot from inside the room we can see that they're actually in treatment 3, on the opposite side of the hall.
Continuity mistake: When Squad 51 is dispatched to the "possible assault victim," the address given is "743," but when John and Roy are at the scene the address on the house is 4015.
Continuity mistake: When Dixie walks over to the admitting desk and asks the nurse to stop what she's doing to set up treatment 4, the nurse places the black pen inside the metal folding clipboard and flips it closed, but in the next shot the pen is lying on top of the closed clipboard.
Continuity mistake: At the lion pit, when John loads the photographer onto the stokes he places the yellow blanket package under her head, and as Captain Stanley, Marco, and Roy lift the stokes out of the pit, we can see that the package is under her head the opposite way.
Continuity mistake: When Dixie gives John a tetanus shot because he fell from a skateboard onto cactus, we know they're all in treatment 1, because when Johnny and Roy are at the open door we can see the door and wall (with fire extinguisher) on the opposite side of the hall, but in the next shot from the hallway he and Roy are leaving treatment 4, which is opposite treatment 3.
Continuity mistake: While the boy who has cyanide poisoning is in the ER, Dixie looks through his clothing and finds carved peach pits, and when she directs Brackett's attention to all the carved pits, the items change when it cuts to the closeup. Additionally, that closeup starts out being farther, and we can see that Dixie is not beside the table before it zooms in.
Continuity mistake: When Station 51 is being dispatched to the fire and explosion at Martell Industries, the other companies called are Station 36 and Engine 14, but we see Engine 236 at the scene even though they were not called. This is before Captain Stanley asks dispatch for the second alarm.
Continuity mistake: During the fire at Martell Industries, when Roy and Johnny make a mad dash out of the building before the explosions, and midway Roy's helmet falls to the ground as he keeps running, but in the next shot when he and Johnny reach the engine and dive to the ground, the helmet is hanging around Roy's neck.
Continuity mistake: When Dick introduces Art Fromich to Roy and John, in the wide shots the Biophone is lying on its side atop the squad, but in each of Roy's closeups the Biophone is upright.
I'll Fix It - S4-E2
Deliberate mistake: After Roy and Johnny rescue the man trapped under his house, when the ambulance reaches Rampart, in the shot from inside the ambulance when Roy follows the stretcher out, he stops at the receiving doors and waits for John, who just arrived in the squad, and in this semi-closeup, it's odd and very apparent that it's not actually Randolph Mantooth, it's his double meeting Roy at the door.
Visible crew/equipment: When Roy, John, and Vic are inside stage 3 trying to outrun Charlene, Roy starts climbing down the first ladder, and we can see equipment moving right beside Roy, then when Roy climbs back up and they find the second ladder, more movement can be seen at the bottom of the screen.
Continuity mistake: After Roy and Vic run out of Stage 3, when Johnny backs up and bends down, we can see Charlene, the bear, on all fours, then in the next shot the bear is walking on her hind legs toward the door, but in the next shot from behind Johnny the bear is still on all fours and further back again.
Visible crew/equipment: When Station 51 is dispatched to the structure fire, just as Engine 51 rolls out of the apparatus bay, the reflections of the location shoot's array lighting and two reflector screens are visible on the side of the engine.
Continuity mistake: During the house fire, Marco's holding the hose behind Chet, while Chet is kicking open the front door just before it flashes, but in the next shot both Chet and Marco are manning the hose when the fire flashes, knocking them down the stairs.
Answer: It is standard practice to wet down driveways so that they stand out in a long shot.
stiiggy