Continuity mistake: During the structure fire, when Roy walks into the burning house his SCBA cylinder has a large arrow sticker on it, but when he's in the house searching for the boy it's a completely different tank with two red stickers, then when Roy goes upstairs it's back to the original tank.
Continuity mistake: When Station 51 is dispatched to the man trapped at the construction site, there are closeups of the shaky concrete wall that may collapse before they shore it up with 4x4 support beams, but in following closeups of the same angle those support beams they added have vanished, then they reappear.
Continuity mistake: When Engine 51 rolls up to the Teal house and quickly enter, we can see the flames inside through the living room window - no shade blocks the view, but in the next shot from the living room, the shade is now pulled halfway down the window.
Continuity mistake: When Roy and Johnny are tending to the actor with the possible heart attack, Brackett asks for an EKG strip, so Roy holds out his right hand to give Johnny the cable, but in the next shot Roy's holding out his left hand with the cable.
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.