Elf - Broken Picture
About two-thirds of the way through the movie, Buddy comes into his father's office, announcing to the group that he "Is in love and does'nt care who knows it." After a few minutes, Miles starts beating up Buddy. He then throws him into the wall, causing one of the pictures to fall down and break. You can actually hear the glass shattering. In the next scene, it shows Buddy's father, the two writers, secretary, etc, and behind the secretary's head is the picture up on the wall again! It looks untouched, clearly a slip up!
vVdeo or DVD