Visible crew/equipment: After Station 51 responds to the unknown type rescue, Engine 51 leaves on another run, but when Johnny and Roy go into the house with the wife of the man who lost his voice temporarily due to the dieffenbachia plant, the bulging outline of the lavalier mic transmitter and wire are visible on the back of her white robe.
Continuity mistake: When Brackett's examining the teenager (Donny Most) with paralysis Morton's standing beside him, but in the next shot as Dixie takes the teen's BP, we see Morton standing behind the teen with the student nurse, then Morton's back beside Brackett.
Audio problem: After Johnny gets out of the elevator, Johnny sees a crowd around the treatment room, so Roy tells him that they're interviewing the bank guard who was shot, and when we hear Roy ask, "How'd you make out with the girl from orthopedics," his mouth is saying something different.
Visible crew/equipment: At the horse ranch, after the man falls off the horse John and Roy rush over, and as Johnny leans over him the bulging outline of the lav mic transmitter is visible on the back of Johnny's jacket.
Continuity mistake: After bringing in the atropine overdoses from the daffodil bulbs, in the shot from inside the treatment room when Roy and John leave treatment 3, which is opposite the nurses' station, they turn left to head towards receiving, but next shot they're walking from around the corner in the hallway, then pass that door they just left from.
Audio problem: After John starts telling Roy about how he and Barbara went to a movie, when Squad 51 is dispatched to 'man unconscious at Observation Park', we see a closeup of Roy in the squad as he puts the gearshift into drive, and then we hear the audio of the ignition being turned on.
Continuity mistake: After Roy tells Johnny to call Barbara, while they're standing by the telephone in the kitchen, Squad 51 is dispatched to 'man unconscious at Observation Park', and when the squad rolls out of the apparatus bay, the engine we see parked in the bay is the Crown from the first two seasons, not the current Ward LaFrance.
Continuity mistake: When the parathion victim is brought into the ER, they go into treatment 2, but in the view from inside the treatment room when John opens the door to leave, we can see that he's actually on the opposite side of the hall facing treatment 2, which means he's in treatment 1.
Continuity mistake: At the start of the episode, when Roy and John are going through inventory in the trauma and drug boxes, there are three rolls on the trauma box lid and John takes two of them leaving only one, but it cuts to another angle and now there are two on the lid.
The Promise - S3-E11
Continuity mistake: When Johnny's on the ledge trying to subdue Richard and goes over the side, Johnny's uniform shoes change. The stunt double's shoes have flat soles with ridges.
The Promise - S3-E11
Continuity mistake: When Johnny's on the ledge with Richard, just as Richard awakens he knocks the penlight out of John's pocket, but when Roy joins them on the ledge the penlight is back in Johnny's pocket, beside the green pen.
The Promise - S3-E11
Continuity mistake: When Bo goes to Richard's room for the first time, in the view from inside the patient's room, as Bo pushes open the door we can see the hallway behind him, and there's a perpendicular wall beside the door. This wall does not exist when he visits Richard the second time, because there's a hallway leading to the elevator outside of Richard's door.
The Promise - S3-E11
Continuity mistake: When Bo Jensen goes to Richard's room for the second time, as he pushes open the door we can see there's a wall perpendicular to the door, but when Bo is in the room there's a wide widow covered with curtains where that wall was. The window with curtains can also be seen in the exterior shots, when Richard jumps out the hallway window.
The Promise - S3-E11
Continuity mistake: After Johnny finds the missing mechanic, when he turns him over from his stomach to his back, Johnny's wearing a watch on his left wrist, but in the closeup showing Johnny's arms turning the catatonic mechanic over, Johnny's watch has vanished.
Visible crew/equipment: After Mrs. Mannering walks over to Dixie and asks about her son, when she and Dixie head to Brackett's office, the outline of the lav mic transmitter is visible on the back of Dixie's uniform, and a bulge is also noticeable on the back of Mrs. Mannering's sweater.
Continuity mistake: When Tommy's in the treatment room, drinking chocolate milk and playing with the Lincoln Logs, the building he's putting together changes significantly between the two side shots and the shot facing him.
Visible crew/equipment: When 51's guys are sitting around the table discussing the inheritance, numerous overhead set lights are reflected on the chrome coffee pot's surface.
Continuity mistake: When Dixie opens the door to Brackett's office, there's a pile of white papers on the desk in front of Brackett, but when he walks out of the office, in the view from the hallway, the desk lamp has moved and there are no papers where there were in the previous shot.
Visible crew/equipment: After Johnny tells Roy not to phone Joanne about the inheritance, when Chet walks into the kitchen announcing that it'll cost $2.25, the small black tape mark is visible on the floor where Johnny and Roy were standing.
Visible crew/equipment: Just before dispatch drops tones for Squad 51 to respond to a heart attack, Johnny's walking past the rear bay door, and we can see the top of the set over the bay door.
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.