Visible crew/equipment: When Morton is talking with the fireman's widow, DeSoto tells Morton that Early wants to see him, and when Morton walks through the door DeSoto's foot moves, and we see the actor's black tape mark on the floor by his foot.
Visible crew/equipment: After Brackett tells Jenny that they may have to put Koki down, Dixie walks into Jenny's isolation room, saying that they have the latest lab report, and the actor's tape mark is visible on the floor at Dixie's feet.
Visible crew/equipment: At the nurses' station, Early asks Dixie about Carol, and when Dr. Knott pulls away in the wheelchair to go get Carol, the actor's tape mark on the floor is visible, precisely where Brackett had been standing moments ago.
Visible crew/equipment: When Early walks over to the nurses' station after removing the boy's stuck finger from the steering wheel, the two actors' tape marks are visible on the floor, where Brackett stands and where Early is about to stand.
Visible crew/equipment: When the babysitter runs into Rampart carrying the boy, both Dixie and Brackett are standing at the nurses' station talking and an actor's white T-mark is visible at Dixie's feet.
Visible crew/equipment: Just as Dixie lets the unconscious teenager's parents walk into the ER treatment room, the actor's T-mark is visible on the floor behind Gage's legs, a moment before Brackett stands at the mark.
Visible crew/equipment: When Early and Brackett try to deal with the elderly group who want to see their friend, as the group walk away toward the waiting room, two actors' T-marks are visible on the floor, one of them is at Dixie's feet, the other beside her.
Visible crew/equipment: When Brackett and Early are in Rampart's staff lounge discussing J.P. Dumont, Brackett agrees to let Early use his charm in the case, and when Early stands up an actor's small T-mark is visible on the floor, where Brackett was standing moments earlier.
Nurse's Wild - S1-E7
Visible crew/equipment: After rescuing the man trapped at the chemical plant, DeSoto and Gage walk into Rampart and when Gage walks up the hallway with Ellen, the actor's black tape mark is visible on the floor, where Gage stops to flirt with the nurse.
The Wedsworth-Townsend Act - S1-E1
Visible crew/equipment: After Gage learns of the death of his last rescue, when he leaves the ER treatment room and passes the wife and daughter, the actor's black tape mark is visible on the floor, at the wife's feet.
Cook's Tour - S1-E4
Visible crew/equipment: When Engine 68 pulls into the site with the suicide who has changed his mind, there is an actor's T-mark on the ground behind DeSoto, as he puts on his jacket.
Cook's Tour - S1-E4
Visible crew/equipment: When Engine 51 returns, after Gage and DeSoto have finished their beef bourguignon, as they walk into the kitchen the actors' black marks are visible on the floor, where they are about to stand.
Cook's Tour - S1-E4
Visible crew/equipment: When Jay walks into the ER treatment room, where his unconscious brother has possible brain damage, two white marks are visible on the floor, behind Dixie, and another couple of marks will become visible as this scene continues.
Cook's Tour - S1-E4
Visible crew/equipment: At Rampart, after the baby's birth, when Gage and DeSoto walk over to Dixie, the first actor's T-mark is visible on the floor just before Gage stands there, and a second actor's mark is visible under the stool, where DeSoto will be seated in a moment.
Visible crew/equipment: Station 51 responds to a building collapse with the trapped boy, and when they enter the building with Tommy's friend, the actor's white T-mark is visible on the floor.
Visible crew/equipment: When Dr. Bracket leaves the treatment room with Jenny, who's being wheeled in the wheelchair, he tells her to see her family doctor just as Dixie exits the door, and the shadow of the moving boom mic is visible on the wall, at the top to the left.
Visible crew/equipment: When Dr. Bracket and Dixie begin to explain to Jenny that she was only hyperventilating, as she sits down in the wheelchair, the actor's tape mark is visible on the floor by the door, just before Dr. Bracket walks over and stands on it.
Visible crew/equipment: When DeSoto calls Gage to where he found the dog, the two actors' tape marks are visible on the floor when Gage sits on his bed.
The Wedsworth-Townsend Act - S1-E1
Visible crew/equipment: When Dixie tells the ambulance attendants to put the girl with the severed right arm in room five, just as the camera tilts down when the first attendant pulls the gurney, the black tape mark is visible on the floor where he was just standing.
Visible crew/equipment: When Gage and DeSoto are driving away from Rampart, discussing DeSoto's possible purchase of a new house, dispatch calls about a traffic accident. In this exterior closeup shot of Squad 51, the reflection of the camera's flatbed vehicle is visible on Squad 51's red surface.
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.