Revealing mistake: At the gas station with the broken pump nozzle, Captain Stanley and the station attendant head to the garage area to see the main shut-off circuit box, which is located at the far right corner of the garage, but in the next shot, we can see the attendant's reflection behind Roy, and he's standing somewhere else off camera, not where he's supposed to be in the next shot with Captain Stanley.
Revealing mistake: At the gas station, when the pump sparks and catches fire, we can see that it's not gasoline on the ground with the water from the fire hose, but instead it's floating thick gobs of stunt fire gel with burning flames.
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.