Continuity mistake: When Johnny's on the phone with Uncle Ernie about the new color TV, in the wide shot Johnny writes down the address of the warehouse, and puts the pen back in his shirt pocket. Then Johnny thanks Uncle Ernie, and when he hangs up the phone, in the next closeup the pen is back in Johnny's hand.
The Lighter-Than-Air Man - S5-E8
Visible crew/equipment: When Station 51 is on the scene with the overturned truck carrying insecticide, that's causing toxic smoke, Captain Stanley asks dispatch to identify the toxicity of trimelanide, and three shots later a crew member walks onscreen from the left, right behind the overturned truck, then realizes his mistake and backs away.
The Lighter-Than-Air Man - S5-E8
Continuity mistake: At the scene of the overturned truck causing toxic smoke, when Chet talks to the driver and then pops out the windshield, in the wide shots the two windshields are intact and not cracked, but in the closeups facing Chet and the closeups facing the driver there are long cracks in the windshield.
Visible crew/equipment: When the man who was unconscious for five minutes is wheeled into the ER, Morton has him taken to treatment 2, and when Carol is taking his blood pressure, the actor's tape mark is visible at her feet, under the gurney.
Continuity mistake: When Station 51 is dispatched to the landslide, the address is given as 2283 Canyon Road, but when they arrive at the house the address is 4102.
Visible crew/equipment: At the construction site with the cardiac arrest, the outline of the lavalier mic transmitter is visible on the back, left side of Johnny's shirt, particularly when lifting the man onto the ambulance stretcher.
The Lighter-Than-Air Man - S5-E8
Visible crew/equipment: At the scene of the bride and groom's traffic accident, when Johnny asks Crockett if he ever thought about a career as a marriage counselor, the outline of the lav mic transmitter is visible on the front of Johnny's shirt.
Visible crew/equipment: After Chet falls through the roof at the structure fire, when Truck 3 raises their ladder, we can see the cameraman/camera's shadow just as the ladder reaches the roof.
Pressure 165 - S5-E7
Visible crew/equipment: When Station 51 is dispatched to the structure fire at the flour company, while en route there's a closeup of Squad 51, and the reflection of the filming vehicle can be seen in the spotlight.
Continuity mistake: When Dixie is having a heart to heart talk with Karen, in the shot facing Dixie she reaches out with her left hand to take the napkin from Karen, but in the closeup it's her right hand that takes the napkin. Additionally, the napkin she takes from Karen is perfectly folded, but it was wrinkled and messy when Karen held it.
Continuity mistake: When Karen first walks into Station 51, her handbag is over her right shoulder, then over her left shoulder and back to her right shoulder again.
Continuity mistake: At the scene of the vehicle accident, when the boy is removed from the overturned car, he has a bruise near his chin that reaches below his mouth area. When he's in the ER, that bruise is now twice the size and reaches his cheek area.
Continuity mistake: When Roy and Johnny climb the electrical tower to rescue the sky diver, in the closeups Johnny hangs onto the diagonal cross beam when he reaches out to Lucky, but in the wide shot the stunt double hangs onto the tower's main vertical frame when he reaches out to Lucky.
Continuity mistake: It's Squad 39 at the construction site with the cardiac victim, but en route to Rampart we see Squad 51 following the ambulance.
Continuity mistake: After examining Tommy, when Brackett speaks to Mrs. Lawson, the boy's mother, her handbag is hanging off her shoulder in all the shots facing Brackett, but in all the shots facing Mrs. Lawson the bag is gone.
Deliberate mistake: When Johnny and Roy are on the Coast Guard copter, responding to 'victim down at cliffs at Catalina Island', there are four closeups of the guys looking out the windows which are flipped shots - note their uniforms are backwards, the paramedic patches are on their right sleeves instead of their left.
Visible crew/equipment: When the man, who walked in with his daughter, has a heart attack at Station 51, while he's lying on the floor in the apparatus bay we can see the top of the set, the part of the ceiling that's incomplete.
Visible crew/equipment: When Roy, Johnny, and Karen are waiting outside the treatment room with the elderly patient, with Brackett and then with Dix, the outlines of the lavalier mic transmitters are visible on the left sides of Roy's and Johnny's shirts, over their belts.
Continuity mistake: During the warehouse fire, Johnny removes his turnout when Captain Stanley calls for the ambulance, then when the ambulance arrives John's wearing the turnout and one burn victim has the sheet over him, but then the turnout and sheet vanish, and as the ambulance attendants bring the stretcher, Johnny places the sheet on the victim, and in the overhead shot as Cap is told about Willy, Johnny's wearing his turnout again. The Biophone also keeps jumping from being beside Squad 51 to being between the victims.
Deliberate mistake: After the fireworks begin exploding at the warehouse fire, when Captain Stanley and Roy are helping Willy out, they are knocked to the ground by an explosion, and in two of the following exterior shots the large sign that reads "Kiddytime Toy Co" is visible. This shot is from season 4, episode "The Screenwriter", when the guys respond to the fire at the toy factory that also made fireworks.
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.