During the fight on the staircase at the end of chapter one, a large vase can be seen both in long shots and close-ups, sitting on the banister. Then, as the fight continues, the vase disappears in close ups, but remains in long shots.
At the beginning of chapter three, when Locke calls the Brent home and finds out he has just missed Eva, he sets down the telephone and the force of this action causes the wall in the lower right of frame to wobble.