During the dinner party scene, Mia accidentally sets the man's arm on fire. The flames were meant to go out when he put his arm in the ice bucket, but they didn't. Anne Hathaway panicked and threw a glass of water on it, which was not scripted. See more...
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Continuity: Right at the start of the movie, when Mia is shown opening her window blinds, there are some books on a shelf to the left. The lowermost is Jane Austen's "Pride and Prejudice", which her grandmother will first give her much later in the movie, together with a rather large book ("The Vanderbilt Complete Book of Etiquette"), in which Mia has already been reading in the immediately preceding scene.
Continuity: When Mia and Michael are talking and Michael asks Mia to come and see his band, keep your eye on the background. You see Lily running to catch up with them and she passes in between two people and doesn't even look at them, then in the next shot she passes them again, points at the boy who has stepped to the side and says "Not you, I don't even know you."
Continuity: In the beginning of the movie Mia slides down the pole to get to the main floor. The next shot is her mom coming down a ladder to the ground floor talking to Mia, but you can see the top of Mia's head in the foreground as she walks down the staircase. Supposedly she's already on the ground floor via the pole.
Continuity: When Mia is in her room preparing to run away, there is a shot of Fat Louie in his carrier, and there is a white spot around his eye. In the rest of the movie he doesn't have a spot on his eye. This is because in the making of the movie there were 4 different cats used to portray Fat Louie. Still a mistake though.