Visible crew/equipment: During the emergency surgery on the boy who was shot with a pellet gun, the wired microphone that is taped to Brackett's shirt with black tape and hidden under his white coat becomes visible when he puts the gloves on, and during the surgery.
Visible crew/equipment: After Station 51 is dispatched to the back hoe that flipped over trapping the driver, when Roy gets out of Squad 51 upon arrival, the reflections of a crew member and part of the camera are visible on the squad's door.
Visible crew/equipment: When Johnny and Roy walk into the staff lounge, to join Morton, Brice, and the other paramedics for the tape review meeting, the two actors’ T-marks are visible under the table, where he and Roy are standing.
Visible crew/equipment: When Johnny is reading out loud from a transcript, while he and Roy head to the tape review meeting in the staff lounge, just after they turn the corner, the three tape marks are visible on the floor. One is for Johnny near the door, and two are for Roy - the first mark for where he originally stands and the second one for when he walks back over to Johnny.
Visible crew/equipment: When Roy, Johnny, and Morton leave the staff lounge talking about Brice, they stop at the nurses’ station, and when Johnny and Roy walk away, the two actors’ tape marks are visible where Morton is still standing and where Roy had just been standing. Additionally, the outlines of the lavalier mic transmitters are visible on the left sides of Roy's and Johnny's shirts, particularly when they stop at the fountain.
Visible crew/equipment: When the woman runs into the ER screaming that her son accidentally shot himself, as she and Brackett race to the door, the actor's black tape mark is visible on the floor behind her, where she had been standing.
Visible crew/equipment: When Brice and his partner see Brackett and he starts talking to Brackett about the regulations regarding reporters, as they walk down the hallway the actor's tape mark is visible on the floor behind them, where Bracket had been standing.
Visible crew/equipment: When the boy who was shot by a pellet gun is wheeled into the treatment room, at the start of the next shot there is a closeup of the domed surgical light fixture, which provides a reflection of crew and equipment, albeit upside-down.
Visible crew/equipment: When the injured father and daughter are wheeled into the treatment room, an actor's tape mark is visible on the floor under the daughter's gurney, and another tape mark is visible on the floor under the father's gurney.
Visible crew/equipment: At the site of the back hoe accident, after the ambulance arrives, when the father of the girl who's trapped under the back hoe gets up and starts walking away from Roy, the reflection of set array lighting is visible on the surface of Squad 51.
Visible crew/equipment: During the back hoe rescue, the outlines of Johnny's and Roy's mic transmitters alternate between being visible at the front and sides of their shirts.
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.