Other mistake: When all the guys are sitting around the table discussing the paramedic problem, while Chet is looking in the fridge for the ketchup, we can see the milk containers on the door have their brand names covered.
Other mistake: While Roy's in the ambulance with the woman who fainted, when she holds out the bag of potato chips, we can see the large brand name on the front of the bag is covered with red tape in two places. Though they neglected to cover the small 'Lays' brand name on the side of the bag.
Other mistake: At the start, while Johnny is cleaning the oven, we can see that the oven cleaner spray can has tape covering its brand name, and anything else on the can that gives away the name of the brand.
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.