Continuity mistake: At the construction site, after the younger patient has been taken to the ambulance, when Roy tells Johnny that it was pretty good radio work, Johnny's holding his helmet, but in the next shot as Johnny stands up his helmet is gone, though there is a helmet near the drug box behind him.
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: 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.
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.
Heavyweight - S3-E5
Continuity mistake: At the structure fire, after Roy helps the pregnant woman down the stairs, when Johnny brings the O2 and blankets for her, we see that Johnny's wearing a SCBA tank with no markings. However, after Roy tells Johnny to take off, when Johnny hurts his shoulder, his tank has two large stickers - a white and a red.
Continuity mistake: When 51's guys are at the back of the station with The Old Engine, Johnny tries cranking it and his watch reads 5:20. Then after Squad 51 is dispatched to the heart attack, when Johnny's on the line with Rampart after defibrillating the patient his watch reads 11:15, then after administering atropine, his watch reads 2:30.
Continuity mistake: At the station, after Johnny has searched through a bunch of papers for the receipt for $8.42, when he gathers them up a yellow paper falls to the floor at his feet, just before Roy suggests putting them in alphabetical order. Then after Johnny stuffs the papers in an envelope and tosses the envelope in the garbage, the paper that fell on the floor has vanished.
Continuity mistake: When Johnny and Roy walk into Councilman Wilby's home, Wilby's wearing a buttoned up shirt and tie, and they place the O2 tank near his feet, but in Wilby's first three closeups the O2 tank is already behind the couch by his head and his shirt is unbuttoned with no tie, but in the wide shots Roy and Johnny haven't even made those changes yet.
Continuity mistake: When Squad 51 is dispatched to a "man locked in a safe", at 1817 South Maplemoor, after the escape artist lets himself out of the safe, when Roy and Johnny head back to the squad the house address reads 4017.
Continuity mistake: At the refinery fire, when Johnny and Roy are on the tower with the collapsed worker, Roy throws the line down to Truck 127's Snorkel for their gear, and as Roy pulls it up, the gear is tied up quite differently depending on the angle of the shot.
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.