Visible crew/equipment: When Gage and DeSoto are on the football field with Steve, the quarterback, the outlines of both the mic transmitter and wire are visible on Gage's shirt as he helps Steve sit down on the gurney. Then when DeSoto takes Steve's blood pressure, the outlines of both the mic transmitter and wire are also visible on the back of DeSoto's shirt.
Visible crew/equipment: When DeSoto and Gage are trying to rescue the unconscious boy stuck in the tree, Gage drills a hole in the tree, and when he reaches down to the oxygen tank and then places the tube in the hole, the outlines of both the mic transmitter and wire are visible on Gage's shirt.
Continuity mistake: When Squad 51 and then Engine 51 are dispatched to the hotel fire, before going in Johnny's SCBA cylinder has a large arrow sticker and Roy's has a large red sticker, but once inside Roy's air cylinder goes back and forth from having an arrow sticker to the red sticker. Then in a few moments, when Marco and Chet go in with the stokes, both of their air cylinders are tall, flat-top and devoid of stickers, but inside their SCBA cylinders are short, round-top and keep switching from having either an arrow or large red stickers.
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.