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: Watch the scene where Michael fights two guys for a purse. Michael calls KITT for help. When KITT jumps off a cliff, an old vehicle is the one that jumps off the cliff instead.
Knight Rider [Pilot; a.k.a. Knight of the Phoenix] (1) - S1-E1
Continuity mistake: If you look closely at KITT throughout the pilot, the position of his scanner lens changes from being the normal scanner that we're all used to, and the scanner being at the very tip of the front bumper. (The latter case is because the car was used for a promo shots to sell to NBC, and after the show was picked up, they changed KITT's look, but still used the earlier shots).
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.
Trivia: Even though William Daniels provided the voice of "K.I.T.T.", he was uncredited throughout the whole series.
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?
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"