Involvement - S5-E19
Revealing mistake: The former head nurse is supposed to be unconscious when she's picked up from the couch. Yet she puts her hand up on a shoulder when being carried out.
Involvement - S5-E19
Visible crew/equipment: On scene at the accident with the tanker carrying liquid hydrogen, after Chet extinguishes the fire that ignited on Johnny's back, when the fire spreads and the car explodes, the car falls onto its side and the FX stunt platform that the car was resting on becomes visible. Then two shots later that platform has vanished, as they hose down the fire.
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.