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.
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Knight Rider (1982)
1 revealing mistake in A Plush Ride - chronological order
Knight Rider [Pilot; a.k.a. Knight of the Phoenix] (1) - S1-E1
Revealing mistake: When KITT takes part in the race and goes up on two wheels, you can see that the stunt driver is behind the wheel and that a dummy is strapped into the passenger's seat.
Knight Rider [Pilot; a.k.a. Knight of the Phoenix] (1) - S1-E1
Devon Miles: Welcome aboard the Knight 2000.
Michael Long: Thank you. What's all this? It looks like Darth Vader's bathroom.
Devon: It's a one-of-a-kind car, Mr. Long. It is the fastest, safest, strongest car in the world. It is also completely fuel-efficient and it is operated entirely by microprocessors, which make it it virtually impossible for it to be involved in any mishap or collision. Unless, of course, specifically so ordered by the pilot.
Michael: Pilot? Don't tell me this thing flies.
Devon: No, but it thinks.
Michael: It thinks? My car thinks?
Devon: We like to think of it as our car.
Sky Knight - S4-E4
Question: In Goliath Returns, K.I.T.T. sky dives off the cliff. So why is he so afraid in Sky Knight?
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Answer: KITT didn't choose to go off the cliff in Goliath Returns, it just happened as he tried to avoid Goliath. Just 'cus it happened, doesn't mean It's gonna cure his fear of "flying"