Revealing mistake: After the shot that shows Herbie spitting sea water from his exhausts, look at the bumper in the next shot of Herbie, when he gets black smoke from his exhausts. The rust doesn't look real, because they used paint to make it look like rust.
Herbie Goes Bananas (1980)
1 revealing mistake
Directed by: Vincent McEveety
Starring: Charles Martin Smith, Cloris Leachman, John Vernon, Stephen W. Burns
Visible crew/equipment: When Herbie turns the corner just prior to entering the building holding the bullfight, the shadow of the camera can be seen at the bottom of the frame.
D.J.: Why do keep calling this car Ocho? Ocho means eight. Can't you read the numbers?
Paco: Sure I can read the numbers. Five and three are eight. Anyone knows that.
Trivia: When Herbie is made to "walk the plank" on the cruise liner, a real Volkswagen Beetle was thrown into the sea and was never retrieved.