Visible crew/equipment: While Roy and John are on scene with the "car over cliff" Johnny heads down to the car too quickly, and when he ends up falling his mic transmitter and wire slip out from their hidden area, and become visible on the front of his shirt.
Revealing mistake: When Squad 51 is dispatched to the man who has difficulty breathing, once they arrive and it cuts to a closeup, at the top of the screen there is a small dark film square that moves towards the left corner, and then it stays there in the following shots facing Johnny, until he contacts Rampart on the Biophone.
Visible crew/equipment: When Early and Brackett try to deal with the elderly group who want to see their friend, as the group walk away toward the waiting room, two actors' T-marks are visible on the floor, one of them is at Dixie's feet, the other beside her.
Continuity mistake: When the guys are listening to the baseball game on the radio, dispatch drops tones for Engine 16 and only Squad 51, yet Chet turns the radio off, and all the engine company guys rush out of the day room then head to their rig, even though it's only Roy and John that were dispatched.
Continuity mistake: When the man who doesn't speak English is in treatment 4, there's a closeup of the Datascope 850 monitor, and then the girl points to the EKG monitoring unit behind the gurney and asks Dixie why the thing is bouncing up and down. Problem is that the Datascope 850 is used by the paramedics and it's not actually in that treatment room. The treatment room has a Zenith Travenol unit.
Continuity mistake: When Roy breaks the key in the squad's ignition, while he's holding the broken piece in the two wide shots there's something dangling from the key's hole (another key/keychain), but in the closeup it's just the broken bit in his hand.
Continuity mistake: When the man who doesn't speak English is lying in treatment 4, in Dixie's closeups she and the patient's 'friend' are standing in front of the wall with the white dispenser, but in the repeated wide shots of Early with the patient, that wall is seen behind Early and nobody is standing in front of it.
Visible crew/equipment: When Squad 51 is dispatched to the man trapped in the freezer, Johnny and Roy get into the squad, and the reflection of the large set lighting can be seen on the passenger door and vent window.
Visible crew/equipment: After Squad 51 arrives at the scene of the parachutist who's stuck in the tree, when Roy tells dispatch to have an engine respond to their incident, the reflection of array set lighting is visible on the squad's surface.
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.