Visible crew/equipment: When Roy and John are treating the self-defense instructor, the outlines of the mic transmitter and wire are visible at the side of Roy's shirt.
Fair Fight - S6-E5
Visible crew/equipment: During the structure fire, when we see Engine 15 drive toward and then pass the camera, the large reflection of the location's array lighting is visible on the surface of the engine.
Visible crew/equipment: When the self-defense instructor is teaching the class, the outline of the mic transmitter is visible on the front of his shirt, particularly when he tells the ladies, "Here's a little bit of judo that you'll all be learning too."
Visible crew/equipment: When Station 51 is dispatched to an unknown type rescue, which turns out to be two people stuck on the side of a building, in the first shot of them the aerial camera tilts down and pans right to left, and as it does the reflection of the crane (supporting the camera) is visible on the building's glass siding, and the crane's outboard legs are also visible as the camera follows the squad into the lot.
Visible crew/equipment: After Early and Brackett do the tracheotomy, when Dix leaves treatment 4 and walks up the hallway, the outline of the mic transmitter and wire are visible on the back of her uniform top, and when she sees Johnny in the hallway, the outline of his mic transmitter is visible on the front of his shirt over his belt.
Welcome to Santa Rosa County - S6-E10
Visible crew/equipment: After Sheriff Bittner breaks the door's window to get into the clinic, when they open the door just before they walk inside, the camera's tripod, the corner of the reflector screen, and a crew member wearing a blue/white cap are all visible through the doorway by the porch area.
Visible crew/equipment: When the woman drives her car up to Station 86 with the two injured passengers, the outline of mic transmitter is visible on the back of her sweater, when she gets out of the car.
Visible crew/equipment: At the structure fire at an abandoned building, when Engine 164 arrives, we can see the reflection of the location's array lighting in the driver's side window.
Visible crew/equipment: After Johnny reads the note from Mr. Laurents, which he left with the package of money in the fridge, Captain Stanley walks over to the counter, where the actor's T-mark is visible on the floor.
Visible crew/equipment: At The Game, when Roy and John respond to the possible heart attack which turns out to be a hyperventilating man, his wife stands behind Roy, and the bulging outline of the lavalier mic transmitter is visible on the back of her yellow blouse.
Visible crew/equipment: When Chet is trying unsuccessfully to get Henry to use the dog house, the outline of the mic transmitter is visible on Chet's back.
An Ounce of Prevention - S6-E13
Visible crew/equipment: When Station 51 is dispatched to the man who's ill on the ferris wheel, just as Engine 51 rolls out of the apparatus bay, in the closeup we see the reflection of the array lighting and the reflector screen on the side of the engine.
Visible crew/equipment: When Charlie stops at the station to service Engine 51, while Roy and John are trying to service the squad, the multiple reflections of location array lighting are visible on Charlie's squad, and on Squad 51's spotlight.
Family Ties - S6-E16
Visible crew/equipment: At the house fire, when Chet finds the teenagers in the attic, just after Marco climbs in through the window, we can see the moving shadow of filming equipment (looks like the boom) by the stool.
Visible crew/equipment: When 51's guys are at their practice game, the gymnast is injured and the outline of the mic transmitter is visible on the back of Johnny's T-shirt. (00:16:40)
Visible crew/equipment: After Chet gives Johnny the idea about the TV show, when Chet stands up to leave the kitchen the top of the set is visible at the right corner.
Visible crew/equipment: When Roy walks into the ER with the actor who plays Dr. Ned, the nurse rushes over to Roy, and when she asks him about the actor, we can see the bulge of the lavalier mic transmitter at the back of her uniform.
Visible crew/equipment: When Johnny and Roy are with the man whose fingers are caught in the chain of the garage door opener, just as the man's wife sticks her head out the door to direct 86 to the garage, the outline of the mic transmitter is visible on the back of her blouse.
Visible crew/equipment: At the studio, before John tests Wally's equipment, when Roy says that he's going to get their equipment from the squad, Johnny rushes after him and we see the reflection of the camera crane and array lighting facing Squad 51.
Visible crew/equipment: After Dr. Early tells Mr. Jefferson that he knows who he is, it cuts to Johnny at the table with the typewriter, and the shiny chrome surface of the coffee pot reflects multiple set lights.
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.