Visible crew/equipment: While en route to the accident, just as we hear the dispatcher inform Engine 51 that the fire is out, in the exterior shot of Squad 51 there's black tape covering much of the lightbar's chrome atop the cab, which vanishes when they roll up on the accident scene.
Visible crew/equipment: When Roy and Chet find the unconscious boy in the camper, and Roy tends to the young boy, the outlines of the mic transmitter and wire are visible on the back, right side of Roy's shirt.
Visible crew/equipment: When Roy and Johnny are tending to the man with possible paralysis, who is lying on the ground, the bulging outlines of the lavalier mic transmitter and wire are visible on the back, left side of Johnny's shirt.
Visible crew/equipment: When Brackett walks into the adjoining treatment room to talk to Pete about his pregnant wife, and tells him to sit, the legs (wearing jeans) of the cameraman/crew member are reflected on the chrome of the gurney, as he walks forward when the camera dollies in for a closeup.
Visible crew/equipment: When Johnny, Roy, and the two ambulance attendants lay the injured pregnant woman onto the stretcher, two crew members' hands and a foot become visible as the camera pans too far to the right.
Visible crew/equipment: At the home of the pregnant woman who was shot, the only ones there with Dora are Pete, Roy, Johnny and Vince. When the two ambulance attendants bring in the stretcher, a crew member's entire right arm (wearing short, white sleeve with pinstripes) comes into view on the right side of the screen, as the camera pans back.
Visible crew/equipment: When Johnny and Roy are at the home of the pregnant woman who was shot, the bulging outline of the mic transmitter is visible on the back, left side of Johnny's shirt.
Visible crew/equipment: After Chet's disappearing half-dollar trick, when Squad 51 is dispatched to the gunshot wound, as Roy and Johnny get into the squad numerous set lights are reflected on the squad's chrome spotlight.
Visible crew/equipment: In the locker room, after Chet tells Johnny that he knew all about the practical joke, when they walk to the door together there's a quick glimpse of the cameraman's reflection on the door's glass, before John tells Chet about the fictitious five dollar bill down by Mike's locker.
Visible crew/equipment: When Roy and John get back to the station, and Marco walks up to the squad to talk to the guys about the practical joke they're going to play on Chet, on the squad's spotlight we can see the reflection of the camera, which is in front of the map.
Visible crew/equipment: When Station 51 is dispatched to a man trapped at World Picture Studios, just after they pass the studio's gate, in the moving shot from the left side of Squad 51, the reflection of the cameraman is visible on the lightbar atop the squad's roof.
Visible crew/equipment: After the fake eye exam 51's guys are sitting around the kitchen table, and when Chet tells them that he was sitting in the front row at the movies, there are moving shadows at the bottom, right corner of the screen, which do not belong to the guys.
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.