Visible crew/equipment: When Michael is on the beach after finding the body, the camera is on K.I.T.T. In the rear wheel, you can see the reflection off all the crew standing. This can also be seen in the next scene in the front wheel along with the reflection of the lights. (00:03:40)
Character mistake: When K.I.T.T. is talking about rubies he refers to them as a crystalline form of carbon. Ruby is actually crystalline aluminium oxide.
Knightmares - S2-E11
Revealing mistake: When Michael and KITT are going to jump at the dam in order to save Cara from drowning in the water container just before they jump you can see a stunt ramp below KITT.
Continuity mistake: When Michael steps out of the car to talk with the gypsies his sunglasses appear and disappear randomly.
A Knight in Shining Armor - S2-E13
Revealing mistake: When Michael fights the bad guy at the end of the episode, it's easy to tell that they're both stunt doubles.
A Knight in Shining Armor - S2-E13
Visible crew/equipment: As Michael walks over to KITT and the loud mouth challenges him to a race, a light set up is reflected on the car.
A Knight in Shining Armor - S2-E13
Other mistake: After stopping Stone, Michael calls for KITT. When the car starts up, it's in gear, and the selector goes to P (park). After pinpointing the hidden entrance, the picture is of soft sand hills covering it. When KITT goes to enter, it's a defined entrance with a thin layer of stacked rocks in it.
Continuity mistake: When Michael is getting Dr. Bergstrom out of Goliath, he steps onto K.I.T.T.'s hood and Bergstrom is to his right, in the next shot Bergstrom is to his left.
Continuity mistake: When Michael and Dr. Bergstrom get out of Goliath, the back door is still open. We see both get into K.I.T.T. at the same time since Bergstrom needs Michael's help walking on the hood. But once they're both in the car, the back door is closed and locked without Michael having a chance to. And if the door can close automatically or remotely, then it should have closed with Michael inside.
Continuity mistake: Right after Michael escapes from his cell, he finds KITT in the garage. Michael has KITT pop his hood to work on him, he asks KITT how he feels, the next shot shows KITT's scanner with the hood down, then it goes back to the shot of Michael and the hood is open again.
Continuity mistake: When Gina locks the door after Michael leaves, the close up of the lock is different than the one on the door. On the door, the top of the faceplate is right next to the deadbolt knob, but in the close-up there's a lot more space that you can't even see the top of the faceplate.
Mouth of the Snake [a.k.a. All That Glitters] (1) - S2-E21
Other mistake: At about 7 minutes into the show, you see a US border sign in English and Spanish lying on the ground. The English version says "500 yards ahead." The Spanish version says "150 metros" which is roughly 500 feet, not 500 yards. It is also not clear why a sign fairly far on the Mexican side would have English text at all, especially with wording that is more typical of US rather than Mexican signs. (00:06:49)
Mouth of the Snake [a.k.a. All That Glitters] (1) - S2-E21
Factual error: The scenes outside the motel in Calexico show a large mountain range in the background. Calexico is actually located at or slightly below sea level. The only mountain in the vicinity is Signal Mountain, which is an individual mountain, not a range. (00:24:30)
Continuity mistake: When Michael finds the stolen moving equipment, he parks KITT and then starts to climb down an embankment. The close-up shot of KITT's scanner reveals a tree in the hood's reflection. But when we saw KITT stop, there wasn't a single tree around.
Revealing mistake: The shot of KITT releasing his oil slick at the end of the episode is backwards: "KNIGHT" appears as though it's in a mirror.
Continuity mistake: When KITT is pushed over the mountain by the earthmover, you can see the front bumper is actually a stock Trans-Am bumper instead of KITT's normal one.
Knight of the Drones (1) - S3-E1
Other mistake: When Dr. Hallsten fires the rocket from behind the grill of the car, he uses the red plastic switch cover to launch it, not the actual switch.
Visible crew/equipment: When Michael and Bonnie are in the bathroom looking at the goblin in the mirror, a cameraman can be seen in the bathtub in the reflection of the right side of the mirror.
Continuity mistake: When Michael picks up the locket and opens it, the way he holds it with his fingers changes in the close-up shot.
Lost Knight - S3-E10
Plot hole: The explosion strength of the XPL nitro-plastiqe is very inconsistent. In the opening scenes, six cubes are enough bring down a building. Later, Bobby throws two cubes of it out the passenger window. Oddly, they end up on opposite sides of KITT, and then cause only very minor explosions. In the next scene, Bobby throws the another two cubes of explosive out the window, and those explosions are enough to collapse a power pylon. (00:08:26 - 00:08:49)
Answer: I would say that unless there's visual evidence it was another K.I.T.T. car, as in you could see the bar scanner or cut steering wheel, people on here would correct the mistake by saying more than one 1982 Pontiac Firebird Trans-Am was sold and there's no reason it's meant to be a random car.
Bishop73