The Descendants (2011)

Deliberate mistake: When George Clooney is in the restaurant, he sits down at a booth alone. From a wide shot, he sits down and then they show a close up and he sits down again.

Leonardo22

Matt King: One more question for you.
Brian Speer: Yes?
Matt King: Ever been inside my bedroom?
Brian Speer: Once.
Matt King: You could have had the decency to lie about that one.
Brian Speer: All right, twice.

Trivia: When Matt King visits the house of his ancestors the camera pans over the furniture. There is a picture of the Union Jack, but it is upside down. (It's a common misconception that the Union Jack is the same either way up - the wider diagonal white stripe should be at the top left, or on top on the side of the flag nearest the flagpole).