Plot hole: When Jim is shown what he has to pay for the damages Herbie did to Mr. Wu's shop he says he has no money. First off if he had no money how in the world was he able to put down any money on the red sports car he had just purchased that night? Secondly, what happened to the prize money from all the races he was winning from the previous few months?
Continuity mistake: When the wheel comes off Herbie and the car crashes over the side of the cliff, the bonnet is up, but in the next shot it is down again.
Continuity mistake: When Thorndyke and Havershaw are working in the garage towards the end of the movie, you can see Thorndyke brings down his oil pistol from the ramp when Havershaw reminds him about the wager he made with Mr Wu, but in the next shot Thorndyke is holding his oil pistol near the ramp again.
Continuity mistake: When Thorndyke and Havershaw are working in the garage towards the end of the movie, Thorndyke says to Havershaw "You're despicable!" and squirts oil on him. At this point, you can see the top of Havershaw's overalls is covered in oil, but when Thorndyke squirts oil at him a few shots later, the oil has disappeared.
Continuity mistake: When Tennessee is hanging out of Herbie over a cliff, you can see that the number "53" is missing from Herbie's passenger door.
Continuity mistake: At the start of the El Dorado road race, you can see Herbie leaving the grid when the starter waves the green flag, but after a quick cut to Jim, Carole and Tennessee in Herbie, we see the other cars and Herbie is leaving the grid for a second time.