Other mistake: When Bruce Willis enters the hotel room in Rome to see Julia, Matt Damon reacts twice with surprise when he turns around and sees Bruce.
Factual error: In the movie the poles which houses are built on are situated in the water; one could swim between the poles. That's totally impossible: the poles are drilled in very wet sand (to be compared to a swamp) and you can't reach them from the canals in any way.
Linus Caldwell: You ever notice that Tess looks...
Rusty Ryan: Ooh, don't ever ask that. Ever. Seriously. Not to anyone, especially not to her.
Linus Caldwell: Wait, why not?
Rusty Ryan: Look, it's not in my nature to be mysterious. But I can't talk about it and I can't talk about why.
Trivia: When Topher Grace tells Rusty, "I totally phoned in that Dennis Quaid movie." he is referring to an actual film he starred in, called "In Good Company". (00:15:35)
Question: I'm really bad at remembering faces - was just wondering if the guy who Brad Pitt, George Clooney and Matt Damon meet, and eat with - and play the weird phrases game, is also Le Marque - so technically, did CZJ met her father unofficially, (before Pitt introduces him) when she was interrogating him?
Answer: Le Marque and Matsui (the weird phrase guy) are played by Albert Finney and Robbie Coltrane, respectively (so no, she never met him before).
Xofer