No Big Thing - S1-E8
Other mistake: As KITT meets the pickup with the camper, it appears that KITT has no windshield.
Continuity mistake: Even after KITT's voice modulator changes to the three bars in the episode "Hearts of Stone," any shot of KITT starting himself up still shows the old voice modulator (a simple red square).
Michael Knight: I need ya buddy.
KITT: Right away Michael.
Trivia: The scenes showing the rock slides to form a dam to stop the flood were taken from the 1978 movie, Superman. (00:45:55 - 00:46:25)
More questions & answers from Knight Rider
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