Visible crew/equipment: After Roy and John get back to the station, Chet informs Roy that Captain Stanley wants to talk to him, and when Roy's in the office the actor's tape mark is visible on the floor, as Cap tells him not to tell the other guys and when Roy asks what happened.
Visible crew/equipment: After their shift is over, all the guys wait in the apparatus bay for Captain Stanley to come out, and when Medford walks over to them, an actor's tape mark beside Chet's foot and another near Marco's foot are visible on the floor. Then when Cap walks out, another tape mark is visible on the floor in front of Mike's foot.
Visible crew/equipment: While Johnny and Roy are with the unconscious man who ate daffodil bulbs, when the officer asks the bystanders to move back, the outlines of the lav mic transmitter and wire are visible on the back of the officer's shirt, when he turns around.
Visible crew/equipment: When Boot goes missing and 51's guys search for him, Roy finds Boot under the bed in the dorm, and the outlines of Johnny's mic transmitter and wire are visible on the back of his shirt.
Visible crew/equipment: When the psychiatrist comes to help at Station 86, as she leans over to clean the man's head wound, the bulging outline of the lav mic transmitter is visible on the back of her blouse.
Visible crew/equipment: At Station 86, when the woman brings in her asthmatic son, and talks to Johnny outside, the bulging outline of the mic transmitter is visible on the back of her blouse. Then later, when Johnny walks over to the boy's bed because the patients are being moved to the chopper, the bulging transmitter outline is now at her side.
Visible crew/equipment: After the fire at the Kiddytime Toy Factory, when Roy is in the ambulance and Johnny closes its back doors, the location set lighting is reflected on the glass of the ambulance doors.
Visible crew/equipment: When the dispatcher calls for Station 51 to respond to the "structure fire at the Kiddytime Toy Factory," while Captain Stanley is at the radio receiver base station, the reflection of the camera equipment is visible on the back of the squad's cab as it trucks left.
Visible crew/equipment: During the structure fire, when Roy, Johnny and the security guard are in the upstairs room and Roy closes the doors, just as they start to walk toward the window, the moving shadow of the cameraman and camera are visible on the wall. The shadow is not moving in sync with the guys so we know it's not theirs.
Visible crew/equipment: When Johnny and Roy are with the woman who slipped down into an old abandoned well, the outlines of the lav mic transmitters are visible on the sides of their shirts - Johnny's at his left and Roy's at his right.
Visible crew/equipment: After Squad 51 is dispatched to a "man locked in a safe", when Johnny exits the squad and later when he gets back in, the outline of the lav mic transmitter is visible on the back of his shirt.
Visible crew/equipment: On scene at the two vehicle accident, when Roy and Johnny are tending to the teenagers in the overturned car, the outlines of the mic transmitters and wires are visible on the sides of their shirts.
How Green Was My Thumb? - S3-E17
Visible crew/equipment: After Johnny rescues the man from the wine vat, when he and Roy lay the man down on the ground near the squad, the outlines of the lavalier mic transmitter and wire are visible on the back of Johnny's shirt.
How Green Was My Thumb? - S3-E17
Visible crew/equipment: When Johnny and Roy stop by Mrs. Johnson's home to water her plants, two actors' tape marks are visible on the floor by the door.
Visible crew/equipment: When Roy and Johnny get to the gas station, Captain Stanley tells them to look at the owner of the station, and when the owner leans over and places the nozzle back on the pump, the outlines of the mic transmitter and wire are visible on the back of his shirt.
The Promise - S3-E11
Visible crew/equipment: When Paula walks in the kitchen's back door holding the dog, in the overhead shot the actor's black tape mark is visible on the floor by her feet, which was not there when Johnny had first seen her.
Visible crew/equipment: When Boot follows Chet into Captain Stanley's office and the guys follow Boot, the outlines of Johnny's lav mic transmitter and wire are visible on the back of Johnny's shirt.
Visible crew/equipment: After Roy and Johnny help the woman whose hair was caught in the meat grinder, when they're putting their gear back in the squad, the outlines of the mic transmitters and wires are visible at the backs of Johnny's and Roy's shirts.
Visible crew/equipment: At the scene of the swaying sign accident, when Roy and Johnny get the gear out of the squad the outlines of the mic transmitters are visible on the left side of Johnny's shirt and right side of Roy's. Once they're on the roof both of the mic transmitters' outlines are on the right sides of their shirts, and later when Roy and Gil are pulled up onto the roof, the bulging outline is visible again at Roy's right side.
Visible crew/equipment: When Evelyn and her husband pull up in front of Graymar Plaza, while they're talking in the car, in the shots facing Evelyn the reflection of crew members standing beside the car, on the driver's side, is visible on the building's glass doors.
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.