Cook's Tour - S1-E4
Visible crew/equipment: At the construction site, when Johnny and Roy climb the tower mast, they stop on the blue platform with the crane operator's cab before continuing up to the main jib. When Roy, Johnny, and the man they rescue walk back across the jib the man slips, and there are a few shots showing the underside of the blue platform, and we can see people moving around on that platform overhead. There should only be four people on the tower crane: Roy, Johnny, the man they rescue, and the officer holding the bullhorn, who's standing at the other end of the jib, by the mast. Nobody is supposed to be on that platform.
Other mistake: After the officer hands Les the tranquilizer gun, Les asks which way the tiger went and the officer responds, "Down that aisle," and we see both men, who are standing right beside the self-serve ice cream freezer, moving slowly towards the aisle in front of that ice cream freezer. The problem is that in the next shot, we see the large tiger coming from that exact area in front of the ice cream freezer, as he walks toward the camera on the other end of the aisle. This means that the Bengal tiger, Les, and the officer would have all been standing in the very same spot, at the same time.
Continuity mistake: During the fire at Rampart's lab building 8K, when Roy and Johnny are placing the salvage covers on important records, Johnny is wearing the SCBA tank with the two red stickers and Roy's tank has a large arrow sticker, but when they exit the building their tanks have switched.
An Ounce of Prevention - S6-E13
Visible crew/equipment: When Roy and Johnny are on Tom Jensen's show, the outline of Johnny's lavalier mic transmitter is visible on the front, right of Johnny's shirt, over his belt, as he and Roy begin their demonstration, and also after Jensen's crew member electrocutes himself when Johnny and Roy carry and lay him down near the table. This has nothing to do with the wired mics that are clipped onto Roy's and Johnny's ties for Tom Jensen's show.
Visible crew/equipment: When Johnny and Roy are on the soap opera set treating the 'doctor', the outlines of the lav mic transmitters are visible on the front, left sides of Johnny's and Roy's shirts, above their belts, and the outline of Jody's mic transmitter is visible on the back of her brown sweater.
Continuity mistake: When Johnny and Roy are heading to the parade in The Old Engine, and get sidetracked dealing with a fire rescue, they are wearing the old-style shirts with a ten-button, square bottom bib front, with five buttons on each side. When Captain Stanley laughs at them on the roof, their shirt style differs in the close-up, it's now a nine-button, pointy bottom bib, with four buttons on each side and one button at the bottom point.
Fair Fight - S6-E5
Visible crew/equipment: At Rampart, when Dr. Bracket, DeSoto and Gage are discussing the Hubbards while walking down the hall, two T-marks become visible on the floor behind them when they turn the corner.
Family Ties - S6-E16
Visible crew/equipment: During the structure fire, while the first teenager is being carried down the ladder from the attic window, in the two closeups of Captain Stanley if we look past Engine 116, in the background we can see Universal Studios' GlamorTrams driving by, which provided tours of the studio's backlots. This rescue was filmed at the "Corner House" located on the original "Colonial Street" in the studio's backlot.
Welcome to Santa Rosa County - S6-E10
Other mistake: When Roy and Johnny begin their ascent, the injured rock climbers are shown in a closeup, which then zooms out so we can see the entire area to the left, and the only rope up there is the boys' red rope. When Johnny reaches the boys, he's pulling himself up with the help of a blue rope, which has already been anchored in place near the injured boys. So who put it up there and anchored it? Not the injured boys. Not Johnny. Not Roy, who is still down below.
Propinquity - S3-E20
Visible crew/equipment: When Roy moves the squad forward to tow the wrecked car away from the flames, as he opens the driver side door to get out, we can see the reflection of the silver reflector screen in the squad's long wing mirror.
Inventions - S3-E22
Visible crew/equipment: On site at the major chemical leak, when Johnny burns his hand and falls backward, on the ground behind him there's a crew member that can be seen crouching behind stacked cement bags, looking in Johnny's direction.
Inventions - S3-E22
Visible crew/equipment: When Roy and Dixie are talking at the nurses' station about the "radioactive" truck driver, Johnny walks up to them, and when he removes the rope and stanchion, the actor's tape mark is visible at Johnny's feet.
Visible crew/equipment: When the two ambulance attendants remove and roll the stretcher away from the ambulance, towards the stockbroker with chest pains, just as the words "Directed by Dennis Donnelly" appear onscreen, the moving shadow of the cameraman holding a handheld camera is visible on the ground.
Continuity mistake: When Johnny is in the pool with the guy who somersaulted off the roof, he and Roy insert an esophageal airway to ventilate, but when they lift him out of the pool and load the guy onto the stretcher, the esophageal airway has vanished.
Visible crew/equipment: When Roy and Johnny are with 110 and are on scene at the downed airplane, as they remove the pilot from the aircraft, the silver fire starting canister used for the stunt is visible under the plane, before it becomes engulfed in flames.
Other mistake: After Johnny and Roy are dispatched to the actor with the possible heart attack, Brackett asks them to send an EKG strip, and when Brackett lifts the chart paper to read it, he is not looking at the side that would have the line tracing recorded by the stylus, he is actually looking at the back of the paper as it's rolling out of the machine. Also note that the chart paper is quite blank on both sides. Additionally, just prior to this, when Brackett presses the record tab on the recorder, it just pops back up and does not engage.
Revealing mistake: When Johnny and Roy are crawling on the balcony, during the fire at the apartment complex, when they pass under a window we can see the FX tubes from which the flames shoot out.
Cook's Tour - S1-E4
Visible crew/equipment: At the construction site, when Roy and Johnny walk across the tower crane's main jib, there's a shot of the entire top of the crane, and we can see the cameraman at the tower peak, who is shooting the footage of the stunt guys from the overhead angle. He wasn't in the previous long shot of the crane. This does not refer to the officer who is standing on the main jib.
Visible crew/equipment: After Captain Stanley's clam chowder lunch, the tones drop for the unknown type rescue, and when Cap hands Roy the piece of paper with the location, the reflection of a female crew member is visible on Squad 51's vent window, beside Roy.
Visible crew/equipment: At Vic's party, when Roy and Johnny are walking up the steps of the house (just before seeing Monique), the reflection of the cameraman holding the handheld camera is visible in the door's glass, when he steps backwards as the guys walk in.
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.