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: Those French. They hate us, they smoke, they have a whole relationship with dairy products I don't understand.
More questions & answers from French Kiss
Answer: He says "enchanté" - French for "it's a pleasure to meet you".