When Michael apprehends Willis in the opening chase, KITT's driver's window is up. Moments later, after the police arrive, KITT's driver's window is down.
As Chuck, Michael's potential replacement, is driving KITT around, the driver's window alternates between up and down between various shots.
When Michael crashes into the chemical facility, KITT is completely covered in dust. A moment later, when Michael exits the car, KITT is completely clean.
After stealing KITT from the foundation, Michael drives into LaSalle's mansion and the driveway heading into the mansion is shown and is clear of bushes and any obstructions. Moments later, as Michael speeds into the mansion and drives onto the grass, a hedge is now present at the point where Michael drives onto the lawn.
When Chuck Wallyburton tries out K.I.T.T.'s ski-mode, the sequence of K.I.T.T. "skiing" is obviously "recycled" footage from "Chariot of Gold", a previous KR episode.
When Michael meets LaSalle at the helicopter, the sound of the main rotor turning (along with the engine and tail rotor sounds) are still heard, but the motionless tip of the main rotor can be seen at the top of the screen.
After Michael is suspended, he enters the garage and KITT's speedometer reads 907MPH, even though the car is stationary.
When Michael crashes into the chemical facility, he exits KITT and the speedometer reads "911" even though the car is stationary.
When Michael hijacks KITT ("Back in the saddle") the RPM display is "99" even though the car isn't even moving yet.
The parking meter next to space Michael and KITT occupy in the first scene has expired.
The "3 feet of reinforced concrete" wall looks more like 3 inches of plaster.