Continuity mistake: In the last scene where everybody is in Ray's living room, the strap on Georgia Engel's purse keeps changing positions from hanging from her left shoulder to across her chest. Finally, when both her hands are occupied trying to light a match, her purse slips from her shoulder to her bent elbow. In the next shot, her hands are still not free, but the purse strap is on her shoulder again.
Continuity mistake: When the family is in the hallway after Amy senses Robert smells like smoke, the lampshade on the sconce is crooked in every other shot.
Answer: War.
By whom?
Edwin Starr.