Continuity mistake: When Michael steps out of the car to talk with the gypsies his sunglasses appear and disappear randomly.
Knight Rider [Pilot; a.k.a. Knight of the Phoenix] (1) - S1-E1
Continuity mistake: The wounded electrician falls on the pavement, yet on the close-up is laying on the curb.
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".
No Big Thing - S1-E8
Continuity mistake: KITT tells Michael he is running low on gas. Before they changed to the view of his fuel gauge, it was on the 3rd bottom of the RPM indicator. When they change, it's put on the top just below the RPM indicator, and changes again to the 3rd bottom.
Continuity mistake: Michael fights for his life on KARR. He then jumps to safety on KITT and gets into the car and goes chasing after KARR. The next scene has Michael back on KARR fighting for his life.
Continuity mistake: Watch KITT shoot KARR with the laser. When KITT hits the laser on KARR one of his headlight covers blows off but then returns.
Continuity mistake: When Michael is evading the earth movers you can clearly see his left hand at the 12 o'clock position on a normal round steering wheel, rather than the aircraft-like yoke. (00:12:38)
Good Day at White Rock - S1-E4
Continuity mistake: As the bike gang surround Lonnie by his van, one blond guy has his switch blade in his hand. Both hands switch position rapidly from cut to cut until he starts damaging the decal on the van.
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.
Knight Rider [Pilot; a.k.a. Knight of the Phoenix] (1) - S1-E1
Continuity mistake: When the episode starts, the singer's hand is holding a mic at mouth level, but at waist level in the following shot. Also, the guitar player's hand behind the singer changes position.
Revealing mistake: The inside shots of Kitt's voice modulator are repeated over and over, with the camera slightly moving sideways, to give the impression of the car running. Problem is, many times the car is at a standstill, so the moving camera shot is inconsistent.
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