Continuity mistake: After Squad 51 gets back to the station, Roy and Johnny remain in the squad discussing Roy being the coach, and when the dispatcher drops the tones, we see a closeup of five pair of legs rushing out of the kitchen, even though we should only be seeing four pair of legs, since Roy and Johnny are already in the squad.
Camera Bug - S4-E10
Continuity mistake: After Roy and Johnny are dispatched to Station 68, Bob is lying on the floor with his shirt buttoned up and Roy has his hand on Bob's chest taking his respiration, but when it cuts to Bob's closeup his shirt is already unbuttoned, with the ECG electrode discs and leads in place on his chest. Additionally, in Bob's closeups the leads go from attached to the discs, to unattached, to attached again.
Continuity mistake: After the woman has staggered into the ER she is seated in the wheelchair, and when she jumps out of the wheelchair there is a tall ashtray can behind her beside the wall, but in the next shot that tall ashtray can has vanished.
Continuity mistake: When Johnny and Roy are with the boy who is in anaphylactic shock from the bee sting, Johnny's watch reads 2:25, then 2:35, and then 2:25 again.
Continuity mistake: After Station 51 is dispatched to the fire/explosion at the chemical company, when John heads inside to rescue the chemist, the SCBA cylinder he's wearing has one white sticker and one pinkish sticker. By the time John brings the victim out to the sidewalk, his air tank has changed back and forth repeatedly to one that has two red stickers.
Continuity mistake: When Roy and Johnny get back to the brush fire's base camp, they join the rest of 51's guys who are sitting and eating. During this entire scene, continuity between shots is off. Chet's coffee keeps switching from Johnny's hand to being on the ground, and then between both of Chet's hands to being on the ground. Also, the bread on Chet's sandwich is either white or a darker type, the sandwich size varies, and it also changes hands.
Continuity mistake: When Roy and John are in the ER's staff lounge discussing Donaldson, Roy's button, second from the top, is buttoned up in the wide shots, but is unbuttoned in his closeups during the conversation.
How Green Was My Thumb? - S3-E17
Continuity mistake: When Johnny and Roy visit Mrs. Johnson on the 6th floor, they take the elevator near the nurses' station, at the south end of the ER wing, and when they exit the elevator they turn left to room 603. This is completely impossible considering the actual floor plan of the hospital, since in all the exterior shots of the ER it is only 2-storeys.
Continuity mistake: When Roy and Johnny are with the man in full arrest on the tower at the refinery, Johnny hooks up the Datascope with the wire, but in all the overhead shots there is no wire at the back of the Datascope monitor.
Peace Pipe - S2-E5
Continuity mistake: Before climbing up to the man lying on the scaffolding, when Roy and Johnny put the pompier belts around their waists, both belts are buckled so the tongue buckles and carabiner hooks are at their right sides, but both stuntmen are wearing their belts the opposite way in the wide shots. Notice the axe sheaths are upside down on Johnny's and Roy's belts, but the stuntmen's pompier belts are buckled the right way.
Continuity mistake: During the structure fire, after the security guard has been carried down the ladder, in the interior shot when Johnny follows, he places his injured right leg out the window first, but in the next exterior shot it's his left leg which is out the window, then it's back to his right leg being first out the window.
Continuity mistake: When Roy and Chet go to Rampart to visit Johnny on their day off, Dixie tells them that Johnny's in room 205, but when Chet and Roy walk in the number on the door is 230.
Continuity mistake: When Chet flags down the young driver to get help for the traffic accident victims, the driver's side wing mirror is tilted out at a wide angle in the long shot, but in the next closeup the wing mirror has been pushed flat up against the car, so as not to block the actor during the conversation.
Continuity mistake: When Roy and Johnny are on scene at the boating accident, John contacts Rampart, and in the closeup of the base station telephone, we see the old reel-to-reel tape recorder that was used during season 1, behind the old GE Deskon 3-button telephone. In the next shot Rampart's base station is back to normal.
Continuity mistake: When the stokes with the boating accident victim is being loaded onto the Harbor Patrol boat, Roy's standing behind The Boat in the water and Johnny's in The Boat with the stokes, but in the next shot they've switched places, Roy's in The Boat and Johnny's behind The Boat. Others have also switched places between shots.
Continuity mistake: When 51's guys are standing around Johnny's bed looking at the cat, in the cat's closeups she is facing the locker room, but in the other shots she is facing the opposite way, with the guys behind her.
Continuity mistake: After 17's Captain Harmell has fallen through the warehouse roof, when Roy wraps the tape around Harmell's leg splint, the entire splint is covered by tape when they lift him up the ladder, but when Harmell is carried out of the snorkel, there is much less tape - it's wrapped around the splint only 5-6 times.
Camera Bug - S4-E10
Continuity mistake: When Johnny's leaning through the windshield of the truck carrying dynamite, using the jaws to free the driver, Marco's behind Johnny with the hose fogging them down, and Johnny's clothes get soaked, but in the closeup as Johnny pulls the driver from his seat, Johnny's shirt is completely dry.
Continuity mistake: After Station 51 responds to the stove fire and puts it out, the frustrated woman tosses her handbag over her shoulder with the buckle behind her, but in the next shot the handbag has flipped over with buckle at the front.
Continuity mistake: When Squad 51 is dispatched to the woman whose hair is caught in the meat grinder, time out is 12:34, and right after that quick run they stop by Rampart. Back at the station, after Chet mentions that when they started their shift that morning Boot was fine, they're all dispatched to the gasoline tanker traffic accident, and the time out is 9:18 in the AM. Then the next run Squad 51 responds to is the woman caught in the mixer, and the time out is 15:54.
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.