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.
How Green Was My Thumb? - S3-E17
Visible crew/equipment: Just as Roy opens the door to Mrs. Johnson's apartment and he and Johnny walk in, the shadow of production equipment (looks like a reflector screen on a tripod) is visible on the wall behind them.
How Green Was My Thumb? - S3-E17
Visible crew/equipment: When Johnny follows the nurse as she gets off the elevator on the fourth floor, the outlines of the mic transmitter and wire are visible on the back of the nurse's white uniform.
How Green Was My Thumb? - S3-E17
Visible crew/equipment: When John and Roy are searching for the missing man during the fire at the winery, a flaming piece of debris falls in front of Roy. When Roy climbs up to the deck above him, it cuts to Roy on his knees about to stand up, and we can see someone moving right near him, at the left of the screen, even though he's alone.
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.
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.