Kym has a car wreck on the eve of her sister's wedding by driving straight into a huge rock. When the tow truck driver drops her off at home, you can see the front of the car has no damage.
When Kym and Rachel are talking as Rachel is trying on her dress, Rachel bends down to the floor and her arm disappears from the shot, in the next shot Rachel's side is visible again as if she had stood up instantly.
When Kym returns from the rehearsal dinner the piece of watermelon she eats has a bite taken out of it that disappears and re-appears during the scene. The thickness of the slice also varies.
Just before Kym wrecks the family car, the sound of the motor and the rate at which the scenery passes indicates the car is moving at high speed. However, the speedometer needle indicates a speed of only 5 - 10 miles per hour.
A scene depicts the family arranging the wedding dinner's table seating, moving around small figurines. Kym is hurt that she is not at the family table. The wedding dinner turns out to be held on the lawn, with small tables at which guests can choose their own seat.