Visible crew/equipment: After Roy breaks the window with the chair, the guys place the ladder against the window and Marco starts to climb up. In the next interior shot, just as Roy and Johnny lift the security guard, right outside the window we can see the corner of something else (platform-like), besides the top of the ladder.
Continuity mistake: At the apartment complex fire, after Truck 82 sets its outriggers, Engine 28 is right behind them with their supply line and duals laid out, but quite a few shots later Engine 28 is just pulling up behind 82, even though they were already there all set up.
Continuity mistake: When Station 51 is dispatched to a structure fire (with the two girls trapped upstairs) the address given is 1911 Harper Ave, but when they reach the house with the fire, directly across the street that house number is 1637.
Visible crew/equipment: When Squad 51 arrives at the second location, 1511 East Hill, trying to find the correct address for the attempted suicide, the outline of Johnny's lav mic transmitter is visible at the back of his shirt.
Visible crew/equipment: While Early is listening to the heartbeat of the boy with a heart problem, Dixie is standing beside him, and on the glass case behind them we can see movement in the reflection, even though it's only the three of them in that treatment room.
Visible crew/equipment: At the start, when dispatch interrupts the mannequin practice with a structure fire, after the shot of Mike getting into his turnout, as Engine 51 rolls out of the apparatus bay, the reflection of array set lighting and two reflector screens are visible on the moving engine.
Continuity mistake: When Station 51 is dispatched to the car over the cliff at Bear Mountain, the timeout is 08:12, then when Roy contacts Rampart his watch reads 6:55. When Johnny checks the girl who can't see, his watch reads 12:45, but when Johnny contacts Rampart his watch reads 6:05. Then after the snakebite, when the guys carry Johnny to the back of Engine 51, Johnny's watch reads 10:35.
Revealing mistake: After the snakebite, when the guys carry Johnny and place him at the back of Engine 51, the chrome spotlights are shiny and reflective, but in the closeups the spotlight near Marco has been partially sprayed with a dulling spray, to prevent the camera's reflection.
Visible crew/equipment: At the site of the back hoe accident, after the ambulance arrives, when the father of the girl who's trapped under the back hoe gets up and starts walking away from Roy, the reflection of set array lighting is visible on the surface of Squad 51.
Visible crew/equipment: During the back hoe rescue, the outlines of Johnny's and Roy's mic transmitters alternate between being visible at the front and sides of their shirts.
Continuity mistake: At the scene of the traffic accident, when Johnny tries to calm the woman who cries that she's afraid, it cuts to a shot of Chet as the camera pans to the left, and we see the position of the pickup truck on the road. When they hear the siren of help coming, Chet stands in the road directing the vehicle, and the pickup is not where it was in that earlier shot, it's now much farther down the road.
Continuity mistake: At the start, there's a closeup of Roy, Johnny, and Chet, and it cuts to a long shot of the landscape around them while they're driving, then it cuts back to the closeup. The landscape the Land Rover passed in the long shot is entirely different than in the previous and following closeups.
Visible crew/equipment: Near the end of the episode, when Charlie hitches up The Boat to his pickup truck and drives it away, the reflection of the array set lighting is visible on the pickup's door.
Continuity mistake: When the Coast Guard chopper reaches The Boat that ran aground off Catalina, during the rescue Roy and Johnny are seen wearing water-type shoes, not their uniform shoes.
Continuity mistake: When Johnny's on the phone with Uncle Ernie about the new color TV, in the wide shot Johnny writes down the address of the warehouse, and puts the pen back in his shirt pocket. Then Johnny thanks Uncle Ernie, and when he hangs up the phone, in the next closeup the pen is back in Johnny's hand.
The Lighter-Than-Air Man - S5-E8
Visible crew/equipment: When Station 51 is on the scene with the overturned truck carrying insecticide, that's causing toxic smoke, Captain Stanley asks dispatch to identify the toxicity of trimelanide, and three shots later a crew member walks onscreen from the left, right behind the overturned truck, then realizes his mistake and backs away.
The Lighter-Than-Air Man - S5-E8
Continuity mistake: At the scene of the overturned truck causing toxic smoke, when Chet talks to the driver and then pops out the windshield, in the wide shots the two windshields are intact and not cracked, but in the closeups facing Chet and the closeups facing the driver there are long cracks in the windshield.
Visible crew/equipment: When the man who was unconscious for five minutes is wheeled into the ER, Morton has him taken to treatment 2, and when Carol is taking his blood pressure, the actor's tape mark is visible at her feet, under the gurney.
Continuity mistake: When Station 51 is dispatched to the landslide, the address is given as 2283 Canyon Road, but when they arrive at the house the address is 4102.
Visible crew/equipment: When John and Roy are dispatched to the couple's house, for the second time, after they've checked the rooms upstairs and downstairs they join the couple in the living room, and the reflection of the large overhead set lighting is visible in the mirror hanging over the mantel.
Answer: I believe you are speaking of the old man, Mr. Wilson. He's played by J. Pat O'Malley.
Bishop73
Correct, it was J. Pat O'Malley...he also played the grandfather with his grandson when their rocket exploded, and also played "Old Bill" in the episode with Ann Prentiss, where Gage saves the little girl from the burning tree house, and her mother falls in love with him.