Above and Beyond... Nearly - S5-E20
Continuity mistake: After Station 51 is dispatched to 'man stranded on a cliff', when Roy and John free climb up the cliff, they're not wearing their uniform shoes, they're wearing hiking-type shoes with ridges on the soles.
The Girl on the Balance Beam - S5-E18
Continuity mistake: When Roy and Johnny arrive on scene with the injured gymnast, as they enter the building in the exterior shot it's the last door that's open, but in the next interior shot that last door is shut, and it's the second to last door that's open.
The Girl on the Balance Beam - S5-E18
Continuity mistake: When Johnny and Roy are at the movie studio, while they're dangling from their lifelines they're trying to help the actress dangling from her own lines, but when she freaks out she drops her wand (yes, a wand) in the wide shot, but next closeup she's still holding it.
Propinquity - S3-E20
Continuity mistake: The cut that Roy receives over his eyebrow during the traffic accident changes characteristics, such as when he and John are at the poker game, it looks considerably better in following shots, then it looks much worse again.
Continuity mistake: When Mr. And Mrs. Merkle visit the station the first time, Mrs. Merkle's long, pointed blouse collar jumps under and over her sweater repeatedly.
Continuity mistake: When they pull Mrs. Merkle from under the wrecked car in the restaurant, the BP cuff is not visible around her right arm, but in her closeup she has the wide BP cuff around her arm with the gauge facing up, then in the wide shot once again the BP cuff is not visible.
Continuity mistake: When Marco and Chet use the jaws to lift the car off the victim, Roy begins to get her vitals, then it cuts to Captain Stanley on the Biophone saying, "Vitals second victim, pulse is 120, respiration's 30, she's pale and clammy," but it's not until quite a few shots later that Roy actually shouts those vitals to Captain Stanley.
Continuity mistake: After Roy finds Willy, when he calls Captain Stanley to help get Willy out, Roy's on Willy's left and Captain Stanley's on his right as they rush out, but in the next shot they've switched, Captain Stanley is now on Willy's left and Roy's on his right, just before the explosion.
Continuity mistake: When Karen is assigned to ride along with Squad 51, once they leave the station, en route to the incidents there are only two people seated in the squad instead of three.
Continuity mistake: When Squad 51 is dispatched to 'man down', as the squad heads out of the apparatus bay, the engine we see parked in the bay is the old Crown from seasons 1 and 2, instead of their current Ward LaFrance.
Pressure 165 - S5-E7
Continuity mistake: At the decompression chamber on Catalina Island, after John and Roy introduce themselves to Dr. Scott, the doctor removes the stethoscope from around his neck and puts it down, but in his closeup it's still around his neck, then in the wide shot it's gone, only to return in closeup again.
Continuity mistake: Dispatched to the structure fire are Station 51, Engine 36, Engine 116, and Truck 3. While Johnny and Roy are searching the rooms for the young girl, it cuts to a shot of guys from 9, and later there are also shots of 28's and 19's guys, even though none of their companies were called to this incident. These are shots from previous episodes including 3x7, "Promotion."
The Lighter-Than-Air Man - S5-E8
Continuity mistake: When Station 51 is dispatched to the truck fire, as Captain Stanley responds to the dispatcher Roy and Johnny get into the squad, but we see Marco, Mike and Chet head back to the kitchen instead of getting on the engine, then we see both the engine and squad responding to the incident.
Continuity mistake: When Deke comes into the ER with the two burned firemen and speaks to John and Roy, the window behind them is on the same side as the ER's receiving entrance. Notice that outside the window there's one of those blue metal shades at the top, which does not exist in the exterior shots of that side of the ER.
Continuity mistake: After Roy and Vic run out of Stage 3, when Johnny backs up and bends down, we can see Charlene, the bear, on all fours, then in the next shot the bear is walking on her hind legs toward the door, but in the next shot from behind Johnny the bear is still on all fours and further back again.
Fair Fight - S6-E5
Continuity mistake: At the structure fire, before Roy and Johnny go back through the window to look for the missing doctor, Johnny's and Roy's SCBA cylinders have no stickers, but when Johnny's cutting the door, his tank now has two white stickers and Roy's tank has one on the side, then when they're back outside the stickers are gone.
Fair Fight - S6-E5
Continuity mistake: When John and Roy get back to the station and the other guys tell them to check the dog to see if he's sick, in the shot facing the dog he's lying on the middle couch cushion, but in the shot facing the guys he's lying on the corner couch cushion.
Fair Fight - S6-E5
Continuity mistake: When Roy and Johnny get back to the station, after the cave-in rescue, the dog is lying on the couch on the middle cushion, between Mike and Marco, but in Henry's closeup Mike is gone, and the right side of the couch is empty, then Mike's back, but he vanishes and reappears again.
Continuity mistake: When dispatched to singles club fire, Engine 51 pulls into the parking lot, and there's a shot of Mike hooking up the supply line to the hydrant, with Marco at the side of the engine, but it cuts back to Engine 51 in the lot again, with Mike behind the wheel and Marco sitting in the jump seat, and there is no supply line hooked up, then the engine drives further into the lot.
Continuity mistake: At the singles club fire, after Roy and Johnny go in to look for the missing man, we see Mike charging the lines, then there's a shot of two of 16's guys walking past the stairway with a hose, and notice that on the stairway we can see Johnny's and Roy's legs heading down the stairs. This same shot is shown again after Roy and Johnny check the men's room upstairs, and once again we see Roy and John coming down the stairs when 16's guys walk past them.
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.