The fiddle that Jolie plays makes music despite her not moving her fingers.
The movie takes place in Lafayette, Louisiana in the mid of December just before Christmas. However, it was obviously shot in the mid of summer, and production didn't even try to hide it with artificial snow. Everything is full of green deciduous trees, and bushes. You can hear loud bird singing in day time, and really loud cricket singing in the evening and night. In the second half of the movie, crickets loudly sing even in the day time. In reality, birds don't sing in the autumn and winter, crickets are dead by December, and Lafayette is not green in December and it actually snows in December in Lafayette.
None of the main actors have Louisiana accents despite having lived there most or all of their lives.