One Tree Hill

Chad Michael Murray was the first actor to be cast in the show, though creator Mark Schwahn originally wanted him to play Nathan, having seen him in bad guy roles before. But Murray himself wanted to play Lucas, because he felt that the character had a back story he could connect more to, since he also experienced being abandoned as a child.

Moira Kelly was pregnant during the first season, so Karen was sent to chef school in Italy.

The Tree Hill High gym, where the Raven's games were played, is the gym that Michael Jordan played at when he was in school.