Revealing mistake: While John's in the ambulance with the boy who ingested the poison, after John inserts the esophageal airway and uses the ambu-bag, just as John says, "Real good," if we look out the window behind the attendant, we can see Universal's GlamourTrams (a set of three trams) driving by in the distance. The footage inside the ambulance was shot while the ambulance drove around Universal's lots.
Continuity mistake: After Station 51 is dispatched to 'man down' and realize it's Old Bill when they look through the window, when Roy and Johnny climb through the window their gear is handed in to them, and John takes the drug box with his left hand and Biophone with his right, but in the next interior shot John's taking them with the opposite hands.
Audio problem: In the courtroom, after Roy and John defib the patient who was in full arrest, when John's on the Biophone with Rampart, he says, "We've countershocked 400 watt seconds," but as he continues to say, "Scope now shows...," John's mouth is not in sync with those words.
Continuity mistake: In the courtroom, when the patient goes into V-fib, in the two wide shots while Roy is defibbing the patient, John's holding a tube of conductive gel (for the paddle electrodes), but in John's closeup when he says, "Hit him again," John's hands are empty.
Continuity mistake: When Johnny and Roy walk into the courtroom, Johnny places the drug box on the table with its back facing out, but in the closeups of Johnny and the young lawyer, the drug box is turned the opposite way, with its front facing out.
Continuity mistake: When Roy and Johnny walk into the courtroom, Johnny and the young lawyer kneel down beside the patient's right side, but in the patient's closeup Johnny's kneeling on the opposite side of the resuscitator, near the patient's head, where Johnny will walk to a few shots later, when that young lawyer will once again walk over and kneel down.
Continuity mistake: While Johnny and Roy are standing near the nurses' station, Johnny admits that he promised to take care of Paula's dog, and when Johnny turns his head toward Dixie and Brackett we can see the base station behind him, and in the next shot when Dixie and Brackett walk over, a clipboard has suddenly appeared between the telephone and Biocom EKG unit.
Revealing mistake: After Paula's car door is pulled open, when Roy leans her head back in the shot from behind him, we should be able to see out the right rear window, but the view has been deliberately blacked out from this POV.
Continuity mistake: After Paula's taken in the ambulance, when Roy heads to the wrecked car and pushes the driver's backrest forward revealing Bonnie in the back, we can see that the passenger side door is closed, but in the next shot the passenger side door is wide open.
Continuity mistake: When Johnny's on the Biophone establishing contact with Rampart, there's a closeup of the GE telephone at Rampart's base station, and behind it we can see the tape machine switch is turned to the right, in the 'on' position, but when it cuts to Dixie walking over and responding, the tape machine is not on yet.
Continuity mistake: On scene at Paula's car accident, her houndstooth blazer is lying over the backrest of the front passenger seat, but when Captain Hammer opens the passenger side door it vanishes, then it continues to reappear, disappear, and change position in following shots.
Heavyweight - S3-E5
Continuity mistake: When the little boy who received an electric shock is brought into the ER, in the shot from the hallway he's taken into treatment 4, which is beside the nurses' station, but in the next shot from inside the room, we can see treatment 2 on the opposite side of the hallway, which is next door to treatment 4. This means they're actually in treatment 1, not 4.
Continuity mistake: When 127 hoses down the underside of the overturned trailer, we should be able to see the water spray while John and Roy try to get to the trapped driver in the cab, but we don't even though we hear the audio of the hosing.
Revealing mistake: When Roy and Johnny are in the radioactive lab, loading the unconscious doctor with severe radioactive poisoning onto the stretcher, note that the unconscious doctor is lifting his own left arm, and moving it onto the stretcher so it's resting beside him properly.
Continuity mistake: While Squad 51 leaves the brushfire area with the looter (Tony Dow), when Johnny requests a water drop the helicopter pilot says that he's Copter 2, but the footage we see of the chopper flying overhead is of Copter 14 and Copter 10.
Continuity mistake: While Roy and Johnny are at 86's treating everyone who is being brought in, when Johnny's on the Biophone with Brackett, in Brackett's closeups at the base station, we can see that the actor has a very swollen upper lip. When the officer who was hit by lightning is brought into the ER, Brackett's lip is much less swelled, and more the way it normally looks, but when Brackett is back at the base station, his upper lip is swelled up once again.
The Wedsworth-Townsend Act - S1-E1
Continuity mistake: When the Battalion Chief's car arrives on scene at the factory fire, he and the driver get out of the car, then it cuts to shots as they both stand beside the wall while the Chief talks to dispatch over the HT, but a few shots later we see the driver just getting out of the car as Engine 36 passes.
The Wedsworth-Townsend Act - S1-E1
Continuity mistake: While Roy shows John the squad's right, front compartment, in the closeup of the Datascope a clipboard/notebook with a stack of papers suddenly appears atop the OB kit, which vanishes again in the OB kit's closeup.
The Wedsworth-Townsend Act - S1-E1
Visible crew/equipment: When Roy and John walk into the apparatus bay they stand behind Squad 51, and in this wide shot we can see that the floor area around the squad has nothing on it, but when Squad 51 is dispatched to 'traffic accident with injuries', there is now a long black tape line on the floor, near the front tire.
The Wedsworth-Townsend Act - S1-E1
Visible crew/equipment: When Squad 51 is dispatched to 'traffic accident with injuries', while en route as Johnny says "Hang a left, I know a shortcut," the shadow of filming equipment becomes visible on the hood of the squad.
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.