Propinquity - S3-E20
Visible crew/equipment: At the abandoned refinery, just after Roy attempts to pull out the man pinned under a tank, but is unsuccessful the first time, when it cuts to Captain Stanley and Chet, who are on the third level hosing the fire through the doorway, at the left of the screen a crew member is visible, watching them.
Propinquity - S3-E20
Visible crew/equipment: When Roy moves the squad forward to tow the wrecked car away from the flames, as he opens the driver side door to get out, we can see the reflection of the silver reflector screen in the squad's long wing mirror.
Propinquity - S3-E20
Visible crew/equipment: When Engine 51 first arrives at the abandoned refinery and stops to hook up to the hydrant, the multiple location set lights are reflected on the engine's large windshield.
Propinquity - S3-E20
Visible crew/equipment: When the ambulance that Roy is riding in is involved in a traffic accident, the ambulance driver, Hal, comes out to help, and the outline of the mic transmitter is visible on the back of Hal's white shirt.
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.