Visible crew/equipment: After Johnny carries Cindy down from the treehouse, when Cindy's mother joins them, the bulging outline of the lavalier mic transmitter is visible on the back of her white sweater.
Visible crew/equipment: After Roy, Johnny, and Chet find the victims of the vehicle accident, when Johnny checks on the boy's mother, the bulging outline of the mic transmitter is visible on the back, right side of Johnny's red shirt.
Camera Bug - S4-E10
Visible crew/equipment: At the start of the episode, when Johnny is taking photos of Roy in the locker room, the actor's tape mark is visible on the floor below the bench, where Johnny stands when he shows Roy the article in the newspaper supplement.
Visible crew/equipment: During the structure fire, after Roy and John climb out onto the ledge and the fire flashes in the exterior shots, the next interior shots we see shows stacked boxes falling as the fire flashes through the doors. The interior shots are from episode 3x7, "Promotion", during the structure fire, after the security guard is taken down the ladder. We can even see a crew member's hand pushing a lower box which causes them all to fall.
Visible crew/equipment: When Johnny is bending down while checking on Boot, who's hiding under the bed again, and also as he and Roy walk out of the dorm when Station 51 is dispatched to the 'stove fire', the outline of the lav mic transmitter is visible on the back of Johnny's shirt.
Visible crew/equipment: After Roy and Johnny are dispatched to the woman whose hand is caught in the blender, when they ring the doorbell and then walk to the back door, the outline of the mic transmitter is visible at the back of Johnny's shirt.
The Wedsworth-Townsend Act - S1-E1
Visible crew/equipment: At the very start of the episode, as the camera slowly passes the vehicles and the posts, the moving shadow of the camera is visible on one of the posts at the left as it moves past it.
Visible crew/equipment: After Roy and Johnny have listened to Brackett's tape of 110's rescue, when they get to the squad the outline of the lavalier mic transmitter is visible on the back, right side of Johnny's shirt, as he stores some things in the squad.
Visible crew/equipment: After Roy and Johnny give a CPR demonstration at the ladies' club, when one of the women thanks the paramedics, the outline of the lav mic transmitter is visible on the back of Roy's shirt.
Visible crew/equipment: When Johnny climbs the ladder and then picks up Sheba to carry her off the roof, the outline of the mic transmitter is visible on the back of his shirt. Additionally, as he's lifting Sheba the big dog pushes up against the front of Johnny's shirt, and we hear the crackling noises that were picked up on Johnny's hidden mic.
Visible crew/equipment: In the waiting room, when Dixie brings the couple with the sick little boy (lead poisoning) to the admitting desk, we can see the small tape mark on the floor behind them, where they had just been standing.
Visible crew/equipment: When Dr. Knott comes back to the ER to see the tractor driver before he's discharged, he walks down the hallway with the nurse, and when he stops near Brackett he looks down at the actor's tape mark on the floor, then steps up to his mark. Then after Dr. Knott experiences chest pains, the two actor's marks in the two spots where Brackett had been standing, are visible on the floor as they walk to the treatment room.
Visible crew/equipment: When Squad 51 is dispatched to an 'unknown type rescue', after stopping at the side of the road to talk to the two guys, when the squad follows the motorbike, the corner of the crew's reflector screen becomes visible as the squad pulls onto the road and drives off.
Visible crew/equipment: After rescuing the man from under the engine, when Roy and Johnny load him into the ambulance, the reflections of the array set lighting are visible on the ambulance windows, as Johnny and Roy close the back doors.
Visible crew/equipment: When Roy and John are at the bull corral, trying to rescue the guy who's been gored, in the closeups of the bull we can see metal piping at the top, right corner of the screen, as the camera moves.
Visible crew/equipment: A few shots after Johnny informs Brackett of the victim of the radiation incident, there's a shot of the ER with two orderlies pushing a gurney towards the camera, and the two actors' tape marks are visible on the floor at the bottom of the screen, just before Brackett and Dixie stop there, when Brackett tells Dix to notify the radiation security guard.
Visible crew/equipment: When Chet tells Roy that Captain Stanley wants to see him in the office, a tape mark is visible on the floor in front of Cap, just as he tells Roy not to tell the other guys, and then when Roy asks what happened.
Visible crew/equipment: After Roy helps the looter into the squad, when Johnny goes to the motorcycle and finds the leather bag full of jewelry, the mic wires that run from under his shirt/belt into his right pants pocket (with the transmitter bulge) are visible as he bends down.
Visible crew/equipment: After the looter is helped into the squad, just as Roy gets into the driver's seat, the reflection of camera equipment becomes visible on Squad 51's vent window (not to be confused with Roy's arm or the reflection of the red wing mirror).
Visible crew/equipment: After Roy and John get back to the station, Chet informs Roy that Captain Stanley wants to talk to him, and when Roy's in the office the actor's tape mark is visible on the floor, as Cap tells him not to tell the other guys and when Roy asks what happened.
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.