Revealing mistake: During the rescue of the two mountain climbers who are stuck on the side of a building, when Johnny and Roy are hanging from the lines which are attached to the lifebelts buckled around their waists, we can also see that attached to their lifebelts are carabiners, which are tucked inside their shirts. Those carabiners are presumably attached to extra support under their clothing. Johnny's is particularly visible, while Roy tries to cover his carabiners with his hand.
Continuity mistake: While Roy, John, Brice, and Bob are standing at the nurses' station, there's a closeup of Brice's arm as he explains that he's checking his drug box, and the watch he's wearing in the closeup has a gold/silver metal link watchband, but Brice is wearing a different style watch, with leather straps and buckle.
Continuity mistake: After Brice completely ticks off John regarding the advisory committee while standing at the nurses' station, when John and Roy walk up the hallway to the receiving entrance Roy's not wearing his watch as he's carrying the drug box, but at receiving he's wearing his watch.
Revealing mistake: When Station 51 is dispatched to "accident with injuries," en route one of the camera angles is from the POV behind Roy and John, where the back of the squad is located. The problem is that there's bright sunlight on their backs as they’re driving, when it shouldn't be there. Artistic license is acceptable, but having so much sunlight where it should not be reveals that Squad 51 is not in its normal state.
Continuity mistake: When Johnny and Roy are at the nurses' station talking to Brice and Belliveau about the paramedic advisory committee, both Roy's and Johnny's shirts are all smudged up from the last rescue they just brought in, but when Johnny and Roy head back to the squad their shirts are spotless.
Visible crew/equipment: When Squad 51 is dispatched to 'man injured', in the exterior shot of the squad while en route, when the dispatcher cancels the run the reflection of the filming vehicle can be seen on the side of the squad.
Visible crew/equipment: When Station 51 is dispatched to an unknown type rescue, which turns out to be two people stuck on the side of a building, in the first shot of them the aerial camera tilts down and pans right to left, and as it does the reflection of the crane (supporting the camera) is visible on the building's glass siding, and the crane's outboard legs are also visible as the camera follows the squad into the lot.
Visible crew/equipment: After Early and Brackett do the tracheotomy, when Dix leaves treatment 4 and walks up the hallway, the outline of the mic transmitter and wire are visible on the back of her uniform top, and when she sees Johnny in the hallway, the outline of his mic transmitter is visible on the front of his shirt over his belt.
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.