Loose Ends - S6-E12
Other mistake: While Brackett is a patient at Rampart, he phones to inquire about Tina, and when he rips off his hospital ID bracelet we can see the wood grain bathroom door as he heads for Tina's room. When he's in Tina's room, the wood grain bathroom door in her room is identical to the door in Brackett's room, revealing the same room is used for both patients.
Loose Ends - S6-E12
Other mistake: At the fire in the freight yard, Captain Stanley asks the dispatcher to respond a second-alarm assignment, and then we see Engine 8 pulling out of their apparatus bay and driving down the street. The problem is that this particular shot of Engine 8 is from season 5, episode "Equipment", when Johnny was doing some overtime at Station 8, and we can actually see Johnny sitting on Engine 8.
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.