The bar scene
When Marty asks Debra how long she's known Meurice, she says about 10 years. Then a few minutes later, Meurice asks Debra what her last name is.
Marty: So how long have you know Meurice?
Debra: About ten years.
....
Debra: [after Marty leaves] Nice guy.
Meurice: Not really. What'd you say your last name was?
Did she lie about knowing him for 10 years, or was this a goof?
The stars are ageless, aren't they?