Revealing mistake: There is a scene where KITT drives over to Michael, and you can see the drivers seat is really a guy dressed up in a light brown suit to look like a car seat. You can see for a visor that its a glass panel made to look like a hollow head rest, but you plainly see the guy take away his hand off the steering wheel.
Revealing mistake: During the Comtron Demolition Derby after Buddy sprays oil, Michael asks him not to push another button. Buddy decides to push the next button for Smoke Screen. The license plate is mirrored THGINK (instead of KNIGHT) before the smoke blows.
Add timeJoseph Z
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: When the hoods are trying to take KITT one prepares to toss a brick at the window. If you slow it down, you can see a reflection of the crew member really close to the window. When the "brick" hits the window, you hear breaking glass, but no glass breaks. Also, the brick hits the other hood on the forehead, yet causes no injury, and no bleeding.
Add timeMovie Nut
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.