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.
Revealing mistake: Watch the scene where Michael fights two guys for a purse. Michael calls KITT for help. When KITT jumps off a cliff, an old vehicle is the one that jumps off the cliff instead.
Revealing mistake: When K.I.T.T is called by Michael to get between them at the drive by shooting, you can see on the right side of K.I.T.T all the special effect plugs that replicate gun fire hitting the car. (00:09:20)
Give Me Liberty... or Give Me Death - S1-E15
Revealing mistake: When the van overturns at the end of the episode, you can easily see the padded roll bars used to protect the actors inside. These bars don't appear anywhere else in the episode.
Revealing mistake: When K.I.T.T turbo boosts near the end when chasing the 4x4 you can see the camera strapped to the side of the car. (00:42:35)
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)
White Bird - S1-E19
Revealing mistake: When Michael crashes through the side of the plane, you can see a pulley attached to the front wheel of the plane, which then is released. (00:40:15 - 00:40:50)
White Bird - S1-E19
Revealing mistake: When Michael grabs the newspaper to read about Stevie's abduction, all paragraphs are the same one, starting with the words "The facts".
Revealing mistake: At the beginning when Michael has KITT move the truck, you can see the dolly apparatus that makes the truck's rear end swing out.
Revealing mistake: In the scene where two truckers try to smash up KITT with baseball bats, and KITT supposedly moves a bit backwards by himself, you can see someone 'helping' him near the passenger's seat.
Nobody Does It Better - S1-E21
Revealing mistake: When you see KITT driving after Michael is released from prison, you can see that it is a stunt driver and a normal steering wheel. The driver also isn't talking yet we hear Michael's voice. (00:15:50)
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.
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.
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.
Revealing mistake: Just after Michael is about to be rammed by the two Land Rovers, he jumps onto K.I.T.T. and gets inside. The film must have been reversed as he is sitting on the right-hand side, but when it cuts he is then shown to be sitting on the left-hand side.
Revealing mistake: When Michael and K.I.T.T turbo boost the flame thrower and disable the fire engine, Michael says to K.I.T.T "get the clown." During the shot prior to K.I.T.T pinning the clown in you see the hands steering K.I.T.T appear above the dash.
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