Visible crew/equipment: After Johnny reads the note from Mr. Laurents, which he left with the package of money in the fridge, Captain Stanley walks over to the counter, where the actor's T-mark is visible on the floor.
Continuity mistake: Before Mr. Laurents walks into the station with the bag of money, Roy's holding the coffee pot with his right hand, then it's in his left hand, between shots.
Continuity mistake: After bringing the sportscaster with the heart attack to Rampart, when Roy and John get back to the stadium then realize The Game's over, Roy carries the defib case and drug box, and John carries the resuscitator case and Biophone. All the cases switch hands and switch places between shots.
Visible crew/equipment: At The Game, when Roy and John respond to the possible heart attack which turns out to be a hyperventilating man, his wife stands behind Roy, and the bulging outline of the lavalier mic transmitter is visible on the back of her yellow blouse.
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.
The Girl on the Balance Beam - S5-E18
Visible crew/equipment: While en route to the woman trapped on a wire, the reflection of the cameraman is visible on the windshield after Mike drives past the entrance to Commercial Studios. We see it's not Captain Stanley, but instead it's someone wearing a white shirt, holding up something (presumably the camera) with both hands.
The Girl on the Balance Beam - S5-E18
Visible crew/equipment: At the gym, when Nancy wants to prove that she's feeling fine, she tries to do a cartwheel, and the outlines of the mic transmitter and wire are visible on the back of her leotard.
Visible crew/equipment: When Chet is trying unsuccessfully to get Henry to use the dog house, the outline of the mic transmitter is visible on Chet's back.
Revealing mistake: At the gas station, when the pump sparks and catches fire, we can see that it's not gasoline on the ground with the water from the fire hose, but instead it's floating thick gobs of stunt fire gel with burning flames.
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.
An Ounce of Prevention - S6-E13
Visible crew/equipment: When Station 51 is dispatched to the man who's ill on the ferris wheel, just as Engine 51 rolls out of the apparatus bay, in the closeup we see the reflection of the array lighting and the reflector screen on the side of the engine.
Visible crew/equipment: When Charlie stops at the station to service Engine 51, while Roy and John are trying to service the squad, the multiple reflections of location array lighting are visible on Charlie's squad, and on Squad 51's spotlight.
Family Ties - S6-E16
Visible crew/equipment: At the house fire, when Chet finds the teenagers in the attic, just after Marco climbs in through the window, we can see the moving shadow of filming equipment (looks like the boom) by the stool.
Visible crew/equipment: When 51's guys are at their practice game, the gymnast is injured and the outline of the mic transmitter is visible on the back of Johnny's T-shirt. (00:16:40)
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.
Visible crew/equipment: While Roy's in the office making out the activity report for the training center, Johnny walks over to Ed who is standing beside the map, and when they're dispatched to the overdose, as they get into the squad we can see two tape marks (one white, one black) on the floor, where Johnny and Ed had been standing.
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.