Continuity mistake: When Tommy's in the treatment room, drinking chocolate milk and playing with the Lincoln Logs, the building he's putting together changes significantly between the two side shots and the shot facing him.
Continuity mistake: When Roy and Johnny are climbing the aerial ladder to get to the boy on the ledge, in the overhead long shot we see down below that the Biophone and drug box are placed on the ground, right beside 85's captain. Then later, after the boy tries to jump, the captain instructs one of his men to go get the paramedics' Biophone and drug box, even though we saw them already placed there awhile ago.
Continuity mistake: After rescuing the young boy from the structure fire, when Roy and Johnny are stopped by a reporter with a camera crew and asked questions, the boy is standing behind Roy, then between shots the boy is standing in front of Roy.
Continuity mistake: At the structure fire with the trapped young boy, when Johnny and Roy enter the building Johnny's SCBA tank is all yellow - no stickers, and Roy's tank has a white sticker and a red sticker, but in the following shots looking for the boy until they exit the building, their tanks keep on changing.
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.