Revealing mistake: When the boy is discharged from the ER and is reunited with his dog, John and Roy are standing near the squad watching the reunion, and the usually highly reflective surface of the passenger side spotlight has been sprayed with a dulling spray, to temporarily dull the surface.
Revealing mistake: After Squad 51 is dispatched to the motorcycle accident, there are wide shots of the squad driving through the hills, then in the closeups of Roy and John, the squad shakes from side to side to mimic driving, but we can see that the surrounding rocky area behind the squad (matte painting) does not actually change at all.
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.