I edited the following plot summary from Common Sense about the movie Snow White and the Seven Dwarfs. Find the MISTAKE!

"SNOW WHITE, the first feature-length animated film in movie history, is the original Disney Princess. In a far off kingdom, a wicked Queen  is so evil she forces her lovely step-daughter Snow White  to work as a servant. Obsessively vain, the Queen is only happy when her slave in a magic mirror tells her she's "the plainest one of all." On the fateful day the magic mirror informs her that Snow White is the fairest, the jealous Queen orders a huntsman to kill Snow White and return with her heart. Instead, the huntsman instructs Snow White to flee, and he takes the Queen a pig's heart. Eventually forest animals direct Snow White to a small cottage -- the home of seven dwarfs who become her little friends and protectors. The Queen's mirror, however, knows Snow White is still alive and the fairest, so the Queen will stop at nothing to get rid of her beautiful rival."

The answer: "the plainest one of all." →　"the fairest one of all."