In its original broadcast in the United States on August 13, 2007, "You Know What You Did" was watched by 3.6 million viewers. Consequently, it became the series' most-viewed episode at the time of its first airing; as August 2007, the episode was the network's highest-rated broadcast that year. It was surpassed by "Paris Changes Everything", which served as the premiere for the second half of the season, on March 17, 2008; it attracted 4.8 million viewers in its original airing. In the United States, the third season was released as a four-disc DVD set on July 19, 2008.