Visible crew/equipment: During Johnny's surgery, the top of the set is visible over the door area when the camera angle tilts up, just before Morton comments that there's blood and wonders where it's coming from.
Other mistake: When Early and Morton are examining Johnny, Early tells the nurse, "Type and cross" (the blood vials she's holding), but the weird subtitles read, "Cut and cross." Subtitles from Universal Studios 2010 DVD.
Continuity mistake: When Early walks into the staff lounge after Johnny's surgery, and joins Roy at the table, Early's holding the cup of coffee with his right hand in the shot facing Roy, but in the shot facing Early he's holding the cup with his left hand.
Continuity mistake: While Early is examining Johnny in the ER, telling Roy about symptoms for ruptured liver or spleen, in the closeup Roy's holding up the IV bag with his right hand, but next wide shot it's held up in Roy's left hand.
Visible crew/equipment: After they load Johnny into the ambulance, just as it's about to pull away the reflection of the location's array lighting is visible on the back of the ambulance.
Visible crew/equipment: When Roy and Brice are taking vitals of the possible heart attack, depending on the angle of the shot, the outlines of the mic transmitters can be seen on the backs of Roy's and Brice's shirts.
Continuity mistake: When Johnny is hit by the car, the open drug box is lying on the ground right-side up in the first shot, then upside down in the second shot.
Visible crew/equipment: At the start, after the boy ties a bowline knot in the rope attached to the van, when the mom gets into the van with her daughter, the reflections of two crew members, the cameraman and the top of the camera are all visible in the vent window, in two shots.
Visible crew/equipment: While Johnny and Gage are in the press box with the cardiac arrest, when Brackett tells Johnny to administer the bicarb and epinephrine, the bulging outline of the mic transmitter is visible on the left side of Johnny's shirt.
Other mistake: The USC game that Roy and Johnny are assigned to is supposed to be a sold-out game, but in closeup shots of the crowd around the guys, we can see that around the small crowd of extras used during the shoot, the seats are empty.
Continuity mistake: In the ER staff lounge, when Early and Dixie are watching The Game, there are five books lying on the TV with all their binding facing the right side in the closeups, but in the wide shots the books are facing the opposite way, with binding facing the left.
Continuity mistake: When the injured photographer is brought to the ER, Dix says treatment 7 and we see them heading into 7's door (which is around the corner from treatment 4 and 5, and has no color lines that run past its door) in the shot from the hallway. However, in the next shot from inside the treatment room, we can see they're not in treatment 7, but actually in treatment 4, note the red, green, and yellow lines on the hallway floor in front of its doorway, and treatment 7 has no lines that run past its doorway. When Dixie, Early, and Brackett step into the hallway it's even more obvious.
Continuity mistake: At the start of the USC game, after Johnny uses the Heimlich on the choking guy, when Roy asks him to take a deep breath Roy's left hand is on the man's chest, but in the next shot it is Roy's right hand that's on the man's chest.
Continuity mistake: After the paramedic teams are given their instructions before the start of the USC game, in the closeup the Trojan warrior is given his helmet and he has the sword on the saddle, but he does not have his shield when he turns to ride onto the field, yet in the next shot of the real-life recorded footage the Trojan warrior has the shield.
Continuity mistake: When John is putting the pompier belt around the waist of the man stuck up in the tree, he buckles it so the flap is going towards the man's right, but in the next shot as Chet climbs the ladder behind John, the life belt is around the man's waist the opposite way. Then, when John cuts the rope, the belt is back on the original way.
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.
Visible crew/equipment: At the scene of the traffic accident, after Captain Stanley tells Johnny and Roy that the victim may have a fractured pelvis, just as Johnny places the Biophone on the roof of the car the camera's angle tilts down to face the victim, and we can see the reflection of the cameraman/crew member on the car window.
Visible crew/equipment: When Squad 51 is dispatched to 'man unconscious possible heart attack', while en route, two shots after Roy says "It's gonna be a long run," the reflection of the squad is visible on windows they drive past, and we can see the reflection of a crew member who's standing on the back of the moving squad. Slow motion is not necessary to see this. However, if you're into slo-mo you can catch it again later, when John and Roy head to the traffic accident victim.
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.