Continuity mistake: When Roy's shaving while Johnny's in the shower, Roy fills a bowl with cold water and tosses it into Johnny's shower stall, then goes back to shaving, and the shaving foam on Roy's face changes between these shots.
An Ounce of Prevention - S6-E13
Continuity mistake: During the rescue up on the ferris wheel, Johnny's uniform shoes have changed into shoes with flat soles.
Continuity mistake: At start of episode, when Captain Stanley walks in announcing the upcoming game against 16, the paper he's holding changes hands between shots. Then after Cap sits down, the paper again changes hands between shots. Also notice that after Chet finds Henry's bone behind him in the couch, he gives it to Henry then puts it back behind him again, then gives it to Henry once again.
Continuity mistake: When Captain Stanley is writing on the board about the practice game at 9:00 am on Thursday, the board was clean before he started writing, then the board is dirty, and by the time he walks away the board is clean around what Cap just wrote, and his handwriting and its position on the board have changed as well.
Continuity mistake: After winning the semi-finals basketball game, when Chet walks into the kitchen Roy places a glass of milk on the table in front of Chet, which vanishes in Chet's closeups.
Continuity mistake: During the basketball game against 16, after the ref tell John that he can't call timeout unless they have the ball, Marco passes to Mike, who passes it to Johnny. When 16 gets the ball the blonde player with blue wristbands shoots, but in the closeup it's a brunette without wristbands who scores the basket. Plus the fact that in the closeup the basket he scores in is the one on the other side of the court, and the next few closeups of 16 scoring baskets are in the opposing team's basket, on the other side of the court.
Continuity mistake: After Roy injures his ankle, when Captain Stanley tells Chet that he's replacing Roy, John squirts Cap with the water bottle soaking the front of his shorts, but when they get up to resume The Game Captain Stanley's shorts are completely dry.
Continuity mistake: While Ed is in the field with John and Roy, it's the three of them sitting in Squad 51 when they're en route to their destinations, but in some shots of the moving squad Ed is not seated between them, such as when they respond to the cliff rescue. Additionally, after the purse snatching incident, when they head to Rampart for John's hand injury, only one person's in the squad as it backs up to receiving, even though it should be three.
How Green Was My Thumb? - S3-E17
Continuity mistake: When Roy and John are with the man who has a live grenade in his belly, they're given flak vests. During this scene frayed material on the long horizontal seams, both at the front and on the back of John's vest, suddenly appears, disappears, reappears and disappears again.
Continuity mistake: When all the guys enter the apartment with the doctor lying on the couch, John's carrying the Biophone with his right hand and starts to place it down, but then it cuts to another angle and John's holding the Biophone in his left hand as he places it down.
Continuity mistake: At the scene of the vehicle accident, once Vince wraps the gauze around the head of the driver of the pickup truck, the same bystanders are standing in two places at once - on the sidewalk beside Engine 51 and across the street beside Squad 51.
Continuity mistake: When John and Roy rappel down together after John's rope kinked up, as they reach the bottom Roy and John remove their helmets, but as Wally rappels down both paramedics still have their helmets on in the overhead shot.
Continuity mistake: After Early tells Dr. Ned that he thinks he has mononucleosis, when Early leaves the room, the nurse that's in the room with Dixie walks away from the patient to the other side of the room, but in Dr. Ned's closeups that nurse is still standing behind him while he talks to Dixie.
Inventions - S3-E22
Continuity mistake: When Chet's wearing his suction cup shoes, John uses the hose to wet the area around Chet's shoes, and then places the hose down on the ground, but in the shot from inside the van John's still holding that hose.
Continuity mistake: At the start, when Chet tacks the notices up on the bulletin board, the papers are tacked to the board differently between the closeups and wide shots.
Propinquity - S3-E20
Continuity mistake: Just before the ambulance Roy is riding in is involved in the collision, we see a crowd of people at the corner near the stop sign, but in the next shot they've all vanished, only to reappear just as the vehicles collide.
Propinquity - S3-E20
Continuity mistake: After they load the woman from the wrecked car into the ambulance, Roy and an ambulance attendant are riding in the back with her. In the shots of the moving ambulance, until it's involved in the traffic accident, we should be able to see Roy and the attendant through the windows, but they're simply not there.
Continuity mistake: Before Old Bill wakes up, Brackett, Morton, and Early are talking in the hallway outside Bill's room, and the hallway is a big, wide open space. After Bill wakes up, Dixie goes out to the hallway to get Brackett, and when they walk into Bill's room we can see the hallway behind them, and it's a fraction of the size it was before, only about 4-5 feet wide now.
Continuity mistake: After bringing Old Bill to the ER, when Squad 51 gets back to the station, in the shot of the squad driving backwards toward the driveway, the engine we see parked in the apparatus bay is the Crown from the first two seasons, not their current Ward LaFrance.
Continuity mistake: When Station 51 is dispatched to 'man down', Cindy and her mother are standing in front of the rear bay door, but they vanish in the next shot as the guys get ready to leave.
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.