Visible crew/equipment: When Squad 51 is dispatched to 'man unconscious possible heart attack', while en route, two shots after Roy says "It's gonna be a long run," the reflection of the squad is visible on windows they drive past, and we can see the reflection of a crew member who's standing on the back of the moving squad. Slow motion is not necessary to see this. However, if you're into slo-mo you can catch it again later, when John and Roy head to the traffic accident victim.
Visible crew/equipment: When Roy and Johnny respond to The Boat wreck with injuries off Catalina, they pull up to the Coast Guard Air Station, and when Roy joins Johnny on the other side of Squad 51, the moving reflections of two crew members are visible on the back of the squad.
Visible crew/equipment: When Mr. Laurents visits Station 51, as the guys stand up the actor's T-mark is visible on the floor, between DeSoto and Chet, just before Chet promptly stands at his mark.
Paper Work - S6-E11
Visible crew/equipment: After rescuing the foreman and secretary from the structure fire with nitromethane drums, when Roy and John load them onto the ambulance, as Roy shuts the doors the reflections of multiple array lighting rigs are visible on its window and surface.
Fair Fight - S6-E5
Visible crew/equipment: After Roy and Johnny get back to the station the other guys tell them to check the dog to see if he's sick, and when Roy checks Henry's pupils and Johnny checks his pulse, all the guys are standing behind Johnny and Roy., and we can see the shadows of crew movement in the kitchen at the top right corner of the screen.
Welcome to Santa Rosa County - S6-E10
Visible crew/equipment: When Sheriff Bittner, John, and Roy are driving to the lake after eating lunch together, the bar for the mounted camera is visible on the driver's door, which is only seen in the interior shots of the car.
Visible crew/equipment: After Johnny and Chet begin their arm wrestling, when dispatch drops the tones, there's movement at the front seats of Engine 51 where the camera is located, while Captain Stanley is at the radio base station and Mike is putting on his turnout.
Visible crew/equipment: When Charlie's at the station, complaining that every time one of the squads breaks down it's only crying out for mercy against the drivers, and that firemen are the worst thing to happen to the squads, we can see the reflection of the boom mic on the windshield of Squad 51.
Visible crew/equipment: After winning the semi-finals basketball game against 16, when Captain Stanley, John and Roy walk into the kitchen, Roy and Cap stand near the stove, and two tape marks are visible on the floor.
Visible crew/equipment: At World Picture Corp, after the rescue of the guy with the broken clavicle trapped up on the joists, Morton tells Roy to transport the patient as soon as possible. It cuts to a shot of Squad 51 following the ambulance to ER receiving, and as they drive through the underpass, it's from the POV of inside the squad. Some location lighting becomes visible on the right side, and the reflection of the cameraman's legs are visible on the windshield, as he's seated in the passenger seat. We know that one of the paramedics is in the ambulance, so there should only be a driver in the squad.
Visible crew/equipment: When all the guys are standing around the kitchen table, while Captain Stanley rips the paper so they can draw lots for using The Boat, the actor's tape mark is visible on the floor by Mike's foot.
Family Ties - S6-E16
Visible crew/equipment: After both siblings are carried out of the burning house, when Roy kneels down beside the boy and leans forward to set down the drug box, the bulging outline of Roy's mic transmitter is visible (till the end of the scene) at the front, left side of his shirt, and note that the actor even touches it, possibly to make sure it didn't move out of place.
Visible crew/equipment: At the refinery fire, after Roy gets into the ambulance with the patient Johnny shuts the back doors, and when the ambulance backs up the reflection of a crew member with paperwork (script?) is visible in the left ambulance window.
Welcome to Santa Rosa County - S6-E10
Visible crew/equipment: After Johnny rappels down alone, so he can inform the sheriff of the situation with the injured climbers, when he talks to the sheriff beside the squad car, the reflections of the camera/dolly/crane are visible on the chrome corner of the sheriff's car.
Visible crew/equipment: At the skating rink, when the guys start walking on the ice and go to the two clowns, the outlines of the mic transmitters and wires are visible on Johnny's shirt, as well as on the back of the blonde skater's green outfit. Then, when the ambulance attendants are walking on the ice, the outline of the lead attendant's mic transmitter is visible on the front of his shirt.
Visible crew/equipment: After spending all night on the job, when the tired guys of 51 are at the basketball game, the outlines of the mic transmitters and wires are visible on the backs and sides of 51's jerseys, particularly when Roy gets injured. (00:36:00)
Loose Ends - S6-E12
Visible crew/equipment: At the hospital, when Gage sells the picnic tickets to Dixie and Dr. Early, just as Dr. Brackett walks up to the nurses' station, both Brackett's and Johnny's T-marks are visible on the floor.
Welcome to Santa Rosa County - S6-E10
Visible crew/equipment: Right after rescuing the two injured climbers, when John and Roy are in the back of the pickup truck with them, just as the pickup drives off to follow Sheriff Bittner's squad car, we can see the reflection of crew and the camera rig on the Land Rover's windows.
Visible crew/equipment: At the gas station with the broken pump nozzle, when Roy and Johnny are tending to the woman with the cut on her head, the outlines of Roy's mic transmitter and wire are visible on the left side of his shirt, above his belt. Additionally, note that the office's left pane of glass has been removed to prevent the reflection of the camera facing it.
Visible crew/equipment: While Johnny and Gage are in the press box with the cardiac arrest, when Brackett tells Johnny to administer the bicarb and epinephrine, the bulging outline of the mic transmitter is visible on the left side of Johnny's shirt.
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.