David Hasselhoff and William Daniels (the voice of K.I.T.T.) did not meet until the production's Christmas party, six months after filming season one. Until that point, Hasselhoff had not seen the face behind the voice of the car.
Pontiac, who supplied the Trans Am for the series, found itself swamped with customer requests for black Firebird Trans Ams with T-tops, tan interiors, and red lights on the front bumper, just like the show car.
Patricia McPherson was fired after the first season, and replaced with Rebecca Holden to add more sex appeal to the show. David Hasselhoff was unhappy with the change, and lobbied the producers to hire McPherson back. McPherson returned in the third season.
No long shots of K.I.T.T. are ever seen changing into Super Pursuit Mode, since K.I.T.T. is not moving at all. A shell of K.I.T.T.'s body was used when filming the transition to Super Pursuit Mode, since large hydraulic rams were needed to articulate the body panels, and there was no room for an engine or running gear in the car.
In many of K.I.T.T.'s jumping scenes, the vision cuts to another angle (such as Michael driving) before landing. This is because, more often than not, the front end of the stunt car is heavily damaged upon landing.