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.