Visible crew/equipment: When the vehicle drives into the equestrian centre with the brown horsefloat on the back, you can see the shadows of the camera crew on the ground.
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.
Blind Spot - S2-E5
Continuity mistake: After the KITT and Porsche chase scene, the police officer on the motorcycle comes to a stop in the dead-center of an intersection. But in the next shot when he looks around, he is barely inching into the intersection.
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: When KITT is in the valet carpark, he pushes the cars in front of him forwards. It is very obvious they have attached rubber protectors to the bumpers to prevent damage. Also, when KITT is driving by himself 10 seconds later, you can see the stunt man's hands driving the car.
Knight Rider [Pilot; a.k.a. Knight of the Phoenix] (2) - S1-E2
Continuity mistake: As Michael realises how he will be stopped on the way to the airport, he pulls over. KITT's front lower bumper does not have its spotlights, it is just a plain bumper.
Character mistake: The sign in front of the tank Lt. Ladd is trapped in reads "ORDINANCE TESTING FIELD, DANGER.", but an ordinance is a type of decree or law. They probably meant 'ordnance', which is another word for artillery.
A Nice, Indecent Little Town - S1-E17
Revealing mistake: In the scene where Michael chases the counter fitter and KITT supposedly jumps over some cars with his turbo boost, you can see a jumping ramp which wasn't there before, painted in the colour of the street behind it. (00:25:25)
Continuity mistake: At the beginning of many shows it will show the car's instruments, panning from one to the other. The speedometer will show various speeds in that shot, but a close up of the gauge will then show 55 MPH.
Knight Rider [Pilot; a.k.a. Knight of the Phoenix] (2) - S1-E2
Continuity mistake: After Michael gets shot and gets in his car to race to the airport, he calls Devon on the intercom. Before he gets into the car, he flinches and grasps his left side shoulder area where he was originally shot. When he talks to Devon, he's grasping his right shoulder. After he finishes talking and continuing the drive, he grasps the left one again.
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.
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.
No Big Thing - S1-E8
Continuity mistake: As KITT and the truck approach each other, the terrain alternates from tree lined to wide open. Also in the same sequence, after KITT suggests reverse, Michael's hand is shifting from reverse to the low gears.
Knight Rider [Pilot; a.k.a. Knight of the Phoenix] (1) - S1-E1
Other mistake: After KITT takes over after the hoods steal him, in the big intersection, when KITT's doing donuts, it's a stunt car and driver, as the steering yoke is a regular round wheel.
Other mistake: When the woman plays the video to show the people K.I.T.T, most of the footage you see cannot exist, especially seeing Michael driving inside K.I.T.T on K.I.T.T's monitor. Also when K.I.T.T crashed through the Comtron door from the pilot later on - when Michael sees the footage, this is just footage from other episodes rather than surveillance footage. (00:13:25)
Give Me Liberty... or Give Me Death - S1-E15
Continuity mistake: The General Lee explodes in flames, but in the next shot of the car, you can see that the car on fire is a completely different car. (00:28:50)
Revealing mistake: As KITT is rolling down the hill with the unconscious Michael inside, the shots of KITT from the outside show that the bonnet and roof have large and obvious gaps between them and the rest of the bodywork (presumably a stunt vehicle). When KITT fires it's turbo boost, the bodywork is its normal flush self again.
Lost Knight - S3-E10
Continuity mistake: The red wagon has Bob's plumbing painted on the side of the driver's side door.When being chased by Michael Knight, the sign is missing. It reappears later when Doug is playing inside it.
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.
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