Continuity mistake: The position of the high heels in the barrel, in the church bazaar differ greatly between shots as Karen enters the room, up to when she walks over to find her slingbacks. No-one else touched the shoes in between. They also change position as Karen kindly gives Sally some extra money.
Continuity mistake: After Grace plays Karen's adult video, Karen drops her compact, and powder spills all out of it onto the table. In following shots the powder on the desk changes position and vanishes. In addition the compact case also moves too, and when Karen dropped it onto the table it snapped shut but in a following shot it is open again.