Continuity mistake: At the start, when Roy finds Johnny in the squad reading '1000 Practical Jokes', Johnny's window is rolled down, and Roy places his arms over the passenger side door then leans in to talk to Johnny, but in all of Johnny's closeups Roy's arms are gone.
Continuity mistake: Before 51's guys rescue the burglar trapped in the air conditioning duct, Vince's helmet has a highly polished and reflective surface, but when Vince reads the Miranda rights he's wearing a different helmet, it now has a matte surface.
Continuity mistake: When the man who doesn't speak English is lying in treatment 4, in Dixie's closeups she and the patient's 'friend' are standing in front of the wall with the white dispenser, but in the repeated wide shots of Early with the patient, that wall is seen behind Early and nobody is standing in front of it.
Continuity mistake: After Johnny and Roy get back to the fire's base station and hand the looter over to Vince, when they find Grover in the pen with the other dogs, Roy checks the dog's ID tag and in the two wide shots Roy's holding it with one hand while the other hand is up on the gate, but in closeup both of Roy's hands are holding the collar and ID tag.
Cook's Tour - S1-E4
Continuity mistake: When Squad 51 is dispatched to the 'injury in alley', after John defibs the teenager, when he removes the diagnostic penlight from his belt holster, the kelly forceps fall out of the holster, but when he puts the penlight back into the belt holster the forceps are back in its place.
Continuity mistake: When Roy finds Bonnie in the back seat of the wrecked car, Paula's luggage flips itself around and upright between shots.
The Wedsworth-Townsend Act - S1-E1
Continuity mistake: When Roy and Johnny are with the tunnel worker who's in V-tach, the lights go out in the tunnel and Roy places one of the lanterns on the Biophone, but in closeups of the Biophone the lantern has vanished, then the lantern is back again once they've defibbed successfully.
The Wedsworth-Townsend Act - S1-E1
Continuity mistake: When Roy's on the Biophone with Brackett, after telling him that Dix is one of the victims, Johnny reaches out and takes the receiver from Roy with his left hand, but in the next shot he's taken the receiver with his right hand.
Continuity mistake: When Roy tells the other guys of 51 what they need to do to rescue the doctor, once they're in the hot room, in the wide shot Roy's holding the handie-talkie in his right hand as he's gesturing with that hand, but when it cuts to Roy's closeup the HT has vanished from his right hand, as he's still gesturing.
Continuity mistake: After John makes a sarcastic comment, while he and Roy are in the treatment room with Dr. Early, Roy takes the squad's oxygen tank with him when he leaves the room, but when he exits the ER to get into the squad, the oxygen tank is gone.
Continuity mistake: When Johnny and Roy go into the radioactive lab, Johnny removes his glove to check the doctor's carotid pulse and when they walk through the doorway both his gloves are off (he's holding them), but in the next shot exiting the doorway both of Johnny's gloves are back on.
Continuity mistake: When Squad 51 is dispatched to the heart attack, when Roy opens the apparatus bay door John and Bonnie run underneath, and we can see that Engine 51 is not parked in the bay, but in the exterior shot of the squad pulling out the engine is in the bay.
Continuity mistake: When Roy and John leave the ER after the baby delivery, the base station dispatches them to the motorcycle accident, and in the next shot as the squad turns the corner, there are three people in Squad 51, we see Roy, Johnny and someone seated between them, while they're en route.
Answer: It is standard practice to wet down driveways so that they stand out in a long shot.
stiiggy