When Herbie is racing backwards up the mountain from the jewel thieves, the car starts out covered with debris from the avalanche; when it reaches the top of the mountain, the car is clean once again.
During the races, cars appear and disappear between shots.
The dirt on Herbie's hood as he tries to woo the Lancia outside the café changes between shots.
When the thieves first appear in the museum, in the first shot Max's leg is up and resting on Quincy, but in the next shot both his legs are on the ground.
When Herbie crashes into the table at the gypsy camp, the gypsy setting the table throws both hands in the air, but in the next shot both his arms are at his side.
Contrary to popular belief, yelling and echos wouldn't be enough to cause an avalanche.
At the first qualifying round when Herbie is pivoting to watch the Lancia pull up to the finish line, his wheels don't roll like they're supposed to, indicating that he's on a turning platform.
During the final race, we see Herbie from the perspective of Bruno von Stickle's side mirror, but the 53 on the hood and the license plate read the right way instead of reversed, so it's obviously an optical.
All scenes of an avalanche look all pre-recorded small landslides.
In previous movies Herbie's gas tank filler was in the trunk, because he was a 1960 VW Sunroof Sedan. In this movie the thieves hide the diamond in his gas tank through an external fuel door, so obviously Herbie is no longer a 1960 model. He is now a 1968 VW Sunroof "Beetle" with a finger press fuel door.
At the end of the The Love Bug (1969), Jim Douglas married Carole Bennett; however, in this film, Douglas is apparently single, given his romantic interest in Dianne Darcy. This issue is never addressed in the film, and no mention of Carol or Douglas being married is ever made.