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: At Rampart, when Dixie walks over to Dr. Brackett, who stands behind the station, the tape mark is visible on the floor, just before she steps precisely on it.
The Wedsworth-Townsend Act - S1-E1
Visible crew/equipment: When 127's snorkel is raised to rescue the man who was electrocuted atop a utility pole, as he's being loaded, in the first closeup within the snorkel, we can notice two things. We can see someone wearing denim at the left of the screen between 127's guy and Johnny, and we also see the ground past Johnny's head. Then as the snorkel is still being lowered, in the shot from the same POV, once again at the left we see that crew member wearing denim, who is outside the snorkel basket, and also see the ground, but the ground has not changed. This reveals that these two closeups were shot at ground level.
Visible crew/equipment: When Johnny and Roy are back at the command post and hand over the looter (Tony Dow) to the deputy, the four actors' marks are visible on the ground where they stand.
Visible crew/equipment: At Rampart, when Gage and DeSoto walk into the staff lounge, where Dixie and Dr. Brackett are seated at the table, there is an actor's T-mark on the floor behind Dixie, where DeSoto stands.
Cook's Tour - S1-E4
Visible crew/equipment: After Roy and John pull up to the house with the woman in labor, when the deputy pulls up behind Squad 51, the reflection of production equipment alongside the lamppost is visible on the car's surface. In the previous long shot of the house, we see there is only a large area of grass in front of the house.
Visible crew/equipment: When Brackett, Dixie and Early are working on the unconscious little boy, once Brackett says to go with the pacemaker, multiple black T-marks are visible all over the floor - three under the gurney and one near the cart. Another actor's white tape mark is visible under the gurney (partially blocked by the green oxygen tank), where both Early and Dixie stand at different times.
Visible crew/equipment: On site at the construction accident with the back injury victim, when Roy climbs over the tower's railing we can see the yellow canvas strap attached through the leather loop of his lifebelt, but when he descends to the injured victim, the yellow canvas strap is now also attached to a carabiner protruding from under his turnout coat, by his pants, which presumably is attached to additional hidden support.
Visible crew/equipment: After Engine 51 rolls up to the scene of Paula's car accident, when Captain Hammer stands up in the engine's cab, the reflection of production equipment is visible on the engine's chrome spotlight.
Visible crew/equipment: At the start, when Squad 51 rolls up on the car accident scene, in the shot from inside the squad we can see the entire area around the wrecked car, and there's only a utility pole, short wood fencing, and trees. When Roy and John are treating Paula, and then removing her from the car, in the overhead shots as the camera faces the wrecked car and 51's rigs, there's a very large rectangular shadow being cast over the car, which is presumably from a reflector screen facing the front of the car.
Visible crew/equipment: After Squad 51 is dispatched to the cliff rescue, when Roy and Johnny board Copter 10 at Rampart, the reflection of the production vehicle/equipment is visible on the glass surface at the helicopter's nose.
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.