Visible crew/equipment: During the rescue of the two guys up on the scaffold, when Gage is putting on his pack and harness, an actor's T-mark is visible on the ground, which Captain Stanley promptly stands upon when he asks Gage if he has his handy-talkie.
Continuity mistake: After Squad 51 is dispatched to the 'injured man', when Roy and Johnny get out of the squad, Roy is not wearing his watch as they're walking to the victim while getting hounded by the dog, but in the next shot the watch is back on Roy's wrist as the dog chews on his pants.
Visible crew/equipment: At the scene of the scaffold accident on the side of the building, near the top of the crane, there is a small covered booth that hangs from the crane. We can see the reflection of the hidden second cameraman and his camera in the mirrored windows of the building, as he leans in and out of that booth to film some of the footage we see during this scene.
Revealing mistake: When John and Roy reach the man lying near the pool with a back injury, while Thadeus keeps gnawing and grabbing at Roy's pant leg, we see the extra material that Roy has under the pants (over his socks) to prevent the dog from accidentally harming his legs.
Continuity mistake: While Roy and Johnny are with the back injury victim, his dog, Thadeus, runs off with the BP cuff, and when Roy chases him and falls into the pool, Roy's now wearing the water-type shoes, note the flat sole. Then when he and Johnny leave, the uniform shoes are back.
Other mistake: At the scrapyard with the man who was nearly crushed in the car, when Roy takes his BP the stethoscope chestpiece is on the man's arm in the wide shot, but in the closeup the chestpiece hangs in mid-air not actually touching the man's arm, yet Roy continues to read the BP.
Other mistake: Station 51 responds to an "accident with injuries, " address 7526 Sunset, cross street, Abbott, to rescue two people stuck on scaffolding at the top of the tall building. This distinctive, mirrored glass building was also used this season in episode 6, "Rules of Order", with the address given as 3120 South Century, cross street, Burgess, for the rescue of two people hanging off the side of the tall structure. The actual building address is 500 190th Street, Gardena, CA.
Continuity mistake: While Roy and John are with the man whose back went out, when Thadeus runs off with the BP cuff and Roy chases him, Roy has the stethoscope around his neck with the chest piece hanging down, but once Roy falls into the pool the chest piece is suddenly tucked down into the front of Roy's shirt.
Continuity mistake: While Johnny and Roy are with Dixie at the nurses' station, when Johnny looks for his paycheck in his shirt pockets, his right pocket's flap stays wonky, part in/part out in the closeup, but in the wide shot it's properly flat, then crooked, then straight again. Additionally, after Johnny finds the check in his wallet, he puts it into his left shirt pocket and points at Roy with his empty right hand, but when Early walks over Johnny has that check in right hand.
Continuity mistake: During the scaffold rescue, when John climbs onto the platform he takes off his gloves as he starts to check the victim, but in the wide shot the stuntman is still wearing his gloves as he checks the victim.
Answer: On IMDB, actress Anne Schedeen is listed as playing Nurse Carol on six episodes from 1974-76.