Visible crew/equipment: When Roy and Johnny climb the tower to rescue the man at the top, Johnny slips and Roy helps him down the ladder. When Chet begins his ascent, twice there are shots looking down the center of the tower, and in those two shots the cases of production equipment are visible on the landing where the camera is situated. The print on one case reads "400' MAGS", referring to the filmmaking magazines.
How Green Was My Thumb? - S3-E17
Visible crew/equipment: After Roy and Johnny visit Mrs. Johnson at Rampart, there are three actors' tape marks visible on the floor when they walk past the nurses' station, just before Brackett, Chaplain Miller and Early stand at their marks.
Other mistake: At the end of the episode, when Roy, Johnny, and Chet are at their lockers, Roy comments that Gloria won't make the same mistake twice about the $8.42, and Chet laughs, but the subtitles read, "Marco laughing", even though Marco is not in the scene. Subtitles from Universal Studios 2010 DVD.
Visible crew/equipment: When Roy tells Billy not to get out of the car because of the downed electrical wires, the outlines of the Lav mic transmitter and its cable are visible on the back of Roy's shirt.
Visible crew/equipment: When Brackett tells the orderlies to take the stock broker to the CCU and they tend to him, an actor's T-mark is visible under the gurney while it's still propped up, just before Dixie stands on that spot.
Visible crew/equipment: At the gravel pit, when Roy jumps onto the conveyor belt to reach for the trapped little boy, the outline of the bulging mic transmitter is visible on the back of Roy's shirt.
Visible crew/equipment: After Johnny and Roy arrive on scene with the man trapped behind the semi, when they both put down the splints and drug boxes, the bulging outlines of the mic transmitters are visible on the back of their shirts as they bend over. Then, when Roy leans over to check on the victim, the outlines of the mic transmitter and wire are visible on the back of his shirt.
Visible crew/equipment: After Roy and Johnny pick up supplies at the nurses' station, they walk down the hallway and stop midway to talk about Johnny's insomnia. After speaking a few moments, Johnny and Roy head for the exit, so the camera follows them without cutting away, and when a father and son enter the hospital the camera turns, without cutting away, and follows them up the hallway. Just before the father and son reach the nurses' station, the actors' two black tape mark are visible on the floor behind them, precisely where Roy and Johnny had been speaking.
Visible crew/equipment: When Roy and Johnny are at the nurses' station talking about Johnny's insomnia, after Johnny signs for the supplies, as they walk away the actor's black tape mark is visible on the floor, where Roy had just been standing.
Visible crew/equipment: When the man from The Boat explosion is loaded into the ambulance, the outlines of the mic transmitter and wire are visible on the back of Roy's shirt, as he climbs in after the gurney.
Heavyweight - S3-E5
Visible crew/equipment: When Roy and Johnny are with the guy who got stuck in the tree while hang gliding, the outlines of the mic transmitters and wires are visible on the back of the victim's sweater and also the back of Johnny's shirt as he saws the branch, and then carries the victim to the Stokes.
Visible crew/equipment: When Jason prevents Johnny from falling at the rock quarry, the outline of the mic transmitter is visible on the back of Jason's shirt (left side) in the overhead shot, as he hoists Johnny onto the platform, Then just after Johnny says that they should get out of there, in the shot of Roy bending over the trapped man, the outline of the mic transmitter is visible on the back of Roy's shirt.
Visible crew/equipment: During the boating accident rescue, the outlines of the mic transmitters and wires are visible on the backs of both Johnny's and Roy's shirts, on their right sides.
Visible crew/equipment: When the Battalion Chief, Roy, and Johnny walk into Captain Stanley's office to speak with the officers, two actor's tape marks are visible on the floor in front of the desk.
Visible crew/equipment: When Gage and DeSoto are at Harry Teal's house for the third time, there is an actor's white tape mark on the floor in front of the cabinets, just below where the Biophone is placed.
Visible crew/equipment: When Brackett tells Dixie to have Chet go for the cast, he steps into the hallway to speak with Mr. Kleiner, and as the two start walking up the hallway, the black tape mark is visible on the floor behind them, beside the gurney, precisely where the attendant had been standing.
Visible crew/equipment: In the kitchen, when Roy removes the cap from the soda pop, the actor's black tape mark is visible on the floor behind him, just before Roy steps on it when he talks to Captain Stanley.
Visible crew/equipment: After Gage and DeSoto climb the ladder to get the dog off the roof the second time, when it cuts to Rampart there is a man waiting outside the treatment room, and the actor's tape mark is visible on the floor, at his feet.
Visible crew/equipment: When Roy, Johnny, and Captain Stanley are in the collapsing house trying to rescue the man trapped under it, the outline of the mic transmitter is visible on the back of Roy's shirt when he's leaning over on his knees, as Johnny cuts the carpet. Then the outline of Johnny's mic transmitter is visible on the back of his shirt, when he's below the house.
Visible crew/equipment: When Engine 51 arrives on scene, to join DeSoto and Gage, the guys pull on the pilot to free him from the sailplane, and the outlines of the mic transmitter and cable are visible on the left side of Gage'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.