Other mistake: During the scene where Luc and Kate first meet on the plane and are talking, Luc gets up to go to the bathroom (the second time). When he returns to his seat, the plane has landed, Kate is sleeping, and the other passengers are deboarding. There's no way he would have been allowed to remain in the rest room during a landing.
French Kiss (1995)
1 other mistake - chronological order
Directed by: Lawrence Kasdan
Starring: Jean Reno, Meg Ryan, Kevin Kline, Timothy Hutton
Audio problem: All Air Canada employees speak with a very pronounced French accent rather than the expected French-Canadian accent.
Kate: Did you know that there are four hundred and fifty-two official government cheeses in this country? Don't you think that's incredible? To come up with four hundred and fifty-two ways of classifying what is basically a bacterial process?
Luc: You would prefer one cheese? One cheeseburger to put it on and one restaurant to eat it in?
Kate: I'm saying I like the cheese. God.
More questions & answers from French Kiss
Answer: He says "enchanté" - French for "it's a pleasure to meet you".