Audio problem: In the beginning of the movie when Clark is preparing to light the Bar-B-Q, He squirts charcoal fluid out of a plastic bottle. Then Ellen squirts more fluid onto the coals out of the same plastic bottle. Listen to the sound; it is the distinctive sound of a metal charcoal lighter fluid bottle. (00:07:45)
Audio problem: When Clark is chasing the kidnapper, his car has a blowout. Even in the theatrical version, you hear him say "Darn it all," when it's clear that he's mouthing the F-word, along with something else. (01:26:30)
Audio problem: When the camera thief tells the Griswolds to take their shoes off and get in the fountain, Ellen is heard reacting to the cold water, but she hasn't even gotten in yet.
Audio problem: When the family is atop the Eiffel Tower and Rusty is flirting with a woman, a dog barks but it doesn't make a bark motion. When we see it bark a second time it actually is barking.
Audio problem: After the Griswolds first arrive at the Oktoberfest, there is a wide shot of them walking in with the crowd with the band directly behind them. The drummer is hitting the cymbals but the sound isn't matching.
Answer: The answer could be any of those suggestions. It could also very well be a movie mistake. It's not uncommon for character names to be misspelled, either on some document or in the cast credits.
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