Continuity mistake: When they pull the man with chest pains from the pickup truck, Dixie says treatment 3, which is opposite the receiving entrance and on the same side of the hall as the nurses' station, closest to the red line on the hallway floor, but when Dixie leaves the treatment room it's at the side of the hallway closest to the yellow line, and since there's a window on its door we know it's actually treatment 1 that he's in, not 3.
Character mistake: After Captain Stanley tells the guys about the diet and nutrition study, Cap tells Roy that he and John should go to Oceanside Park for a fire inspection, but later when Johnny's on the HT he tells dispatch to respond Engine 51 to Oceanland Park, not Oceanside Park, and then the dispatcher gives the incident address as Oceanland Park.
Visible crew/equipment: After Station 51 is dispatched to the possible heart attack, when they arrive at the scene it cuts to the interior shot of the pregnant woman walking to the door, and we can see the shadow of the cameraman moving across the lamp and curtains.
The Tycoons - S5-E23
Visible crew/equipment: After Station 51 is dispatched to the fire, a dumpster fire already put out by Phyllis, when Mike parks the engine, the reflection of crew members are visible on the jumpseat window, and the location's array lighting is visible on the engine's surface.
The Tycoons - S5-E23
Other mistake: When the patient with the heart wound is brought to the ER, the anesthesiologist brings the cart with a ventilating unit close to patient, then there are two closeups of Bird's Mark 4 unit and the bellows housing showing inflation and deflation, and on the bellows unit it reads "Animal Anesthesia Ventilator" made by Bird. This is also the same closeup we see of the ventilator unit in 4x18, "Prestidigitation," during the surgery on Brackett's father.
The Tycoons - S5-E23
Other mistake: When Roy and Johnny are with the victim who has a projectile in his heart from a lawn mower, Brackett asks for an EKG strip and there's a closeup of the Datascope monitor, even though the Datascope is not actually in the ER's base station room (it's also still in the squad at this point). Also interesting to note, when Brackett walks out of the base station and tells Early about the heart wound, Early turns the medical chart he's holding at an angle, looks down at it and it appears that he's reading his line from the chart. Then when the ambulance arrives at the scene, the stethoscope is around Johnny's neck, then it's back around Roy's neck as Johnny's lifting the patient, then it's gone from Roy's neck, and then Johnny puts it back around Roy's neck.
Other mistake: When Roy and Johnny help free the man whose arm is trapped in the pipe, just as the man stands up we can see the boxes of detergent on the shelf behind him, with their brand names covered with black tape.
Visible crew/equipment: When they wheel Dianne (the OD) into the ER it's one long continuous shot from receiving to treatment 1, shot from the POV of the patient lying on the stretcher. As she's wheeled into treatment 1, the camera faces Johnny so we can see up the hallway behind him, and the entire admitting desk and waiting area are all blacked out, and there are two men, one of which (possibly the director) is sitting on a chair facing up the hallway where Johnny is and the scene is taking place.
Visible crew/equipment: After Station 51 is dispatched to the fire at the marine salvage yard, when they arrive at the scene we can see a second cameraman on his knees beside the camera, as he is shooting footage of the ship from that specific angle, which we see during this scene.
Visible crew/equipment: When Station 51 is dispatched to the injured sky diver, we can see the area around the electrical tower when they arrive, particularly where Roy and Johnny start climbing up. When Johnny rappels down with Lucky, in the wide shot, just as they reach the ground the crew's ladder can be seen at the right side of the screen, in the same area where Johnny and Roy started their climb.
Visible crew/equipment: After the guys rescue the woman who was trapped upside down in the wrecked car, when they load her into the ambulance, the location set lighting is reflected on the glass of the ambulance doors.
Continuity mistake: When Johnny and Roy are at the apartment building with the broken elevator, Roy's watch is gone when they climb the steps, but he's wearing the watch when they enter the apartment, then it vanishes when they head back down. That watch reappears again, disappears and reappears until they go back up to the apartment for the second time.
The Tycoons - S5-E23
Visible crew/equipment: At the chemical plant fire, when Gage is covered in the flammable pentane, Chet hoses him down. When Marco says "John, you better stay here, " Chet and Marco head off. In the next shot, when the camera pans quickly to the left of the blaze, one crew member wearing jeans and a white shirt stands behind the firemen, and another crew member wearing a grey shirt crouches at the side.
The Tycoons - S5-E23
Visible crew/equipment: At the chemical plant fire all the plant personnel are evacuated. When Gage yells that one of the valves blew, and that he's covered in the flammable pentane, the camera spins around and a crew member is visible on the right side of the screen, just as Captain Stanley and DeSoto walk up and pass him.
The Tycoons - S5-E23
Visible crew/equipment: After the alley's dumpster fire has been put out by Phyllis, when Captain Stanley tells Marco to wash it down, two tape marks and one T-mark are all visible on the ground.
Visible crew/equipment: When the guys are looking at the vitamins that Chet brought for them 51's tones drop, and as they leave the kitchen the two actors' T-marks are visible on the floor where Mike and Marco had been standing.
Visible crew/equipment: After Captain Stanley tells the guys about the doctor who's doing the diet/nutrition study, when they leave to check the new refinery hydrants, the actor's T-mark is visible on the floor where DeSoto had been standing. Also note that DeSoto is wearing slippers when he stands up. It happens again later, he's wearing slippers with no socks when Morton is talking to the guys about stress and diet.
Visible crew/equipment: When Gage and DeSoto are on their first run (the mother-in-law), they phone Rampart's base station. When Dixie opens the door to answer the call, her mark (strip of black tape) is visible on the floor just as she steps on it.
Other mistake: After Johnny is hit by the car Roy kneels down beside him and shouts, "Trauma box!" but the subtitles read, "Code box!" There is no code box. Subtitles from Universal Studios 2010 DVD.
Other mistake: After Chet's practical joke on Karen, she's quite ticked off, and Roy and Johnny are a bit uncomfortable, and then when Station 51 is dispatched to the unknown type rescue they all head to the apparatus bay. In the next shot when Karen, Roy, and Johnny get into the squad just watch all the actors' faces. First Johnny cracks up, then Roy and Karen, who even put their heads down to hide their laughter, particularly Roy who ducks his head behind the steering wheel. Fun to watch.
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.