Director Angela Robinson said in the commentary that she purposely left hidden crew equipment and cheap camera tricks in the film to give Herbie fans something to look for that was fun, and also just to simply aggravate her editor, who practically begged her to fix the problems before the film was released.
The original script was green-lit largely because the studio liked its decisions to A) place the Herbie character into a realistic world and B) make Herbie's powers subtle, and presented in small increments. Later script revisions ended up presenting a more cartoonish and fantasy-based world.
Herbie The Love Bug was a 1963 Volkswagen Beetle deluxe ragtop sedan painted in Volkswagen L87 pearl white. Under normal circumstances, the interior would be a matching white. However, Herbie's interior was painted a special non-reflective grey color so the camera and studio lights would not reflect.
Some deleted and alternate footage appears in the movie's trailer: A shot of Charisma (Jill Ritchie) in the kitchen saying "Whoa". The shot of the Mexican-looking guy in the crowd lowering his glasses is flipped, though the text on the signs in the background is not reversed. So either the shot in the trailer or the one in the film was digitally corrected so that the text would not be backwards. A shot of Herbie making a "crazy face" at Trip Murphy (Matt Dillon) shows him lying on the ground facing Herbie (his knee is in the shot). In the movie, his back is to Herbie. Ray Peyton, Sr. (Michael Keaton) and Maggie (Lindsay Lohan) by the trophy and plaque wall, where she says to him "I didn't know that you took out another mortgage on the house." A shot of Maggie falling back onto her bed.
Cameo: (Dodge Charger from The Fast and the Furious (2001)) When Maggie is pretending to race in a stock car in the junkyard, it's the same Dodge Charger from the end of The Fast And The Furious (2001). You can tell by the damage to the left fender and the roof.
Just before the start of the street race between Maggie (Lindsay Lohan) and Trip Murphy (Matt Dillon) the camera pans in on Herbie's engine then exits thru the muffler just as the race begins. A possible nod to The Fast and the Furious (2001).
The trivia item below may give away important plot points.
During the destruction durby an Apollo 3500 gt can be seen near and around Herbie. This car (except for dents and poor condition) is identical to the Thorndyke special, from The Love Bug(1968) in which Herbie's owner at the time, Jim Douglas is eyeballing throughout the film.