The title of this episode "Charlie don't surf" is a famous line from the movie Apocalypse Now. The film stars Martin Sheen, father of the episode's director, Emilio Estevez. It is also the name a song by the Clash.
Emilio Estevez (Director of this episode) and David Krumholtz (Charlie) previously worked together on Bobby (2006).
The episode is called "Charlie Don't Surf" but in fact, Charlie goes out twice to attempt surfing.