Hiding a secret, Callie helps Daphne prepare for an official visit with her daughter, but both fear they will be recognized for their past actions. Things go awry when Brandon's band play a 'pharm' party. With Mariana's urging, Stef and Lena consider Ana's proposal. Jesus is offered an opportunity to attend a top-rated wrestling school.
- The episode title, If You Only Knew, is most likely referring to Stef and Lena not knowing about about Callie's role in the kidnapping of Daphne's daughter, Tasha.
- Callie is still on probation.
- Mariana starts wearing contacts and then eye glasses. It is shown that her sight is not very good.
- Lou tells Brandon that she is not used to people caring about her like he does. It is implied that Lou is not raised under great circumstances.
- Main Article: Music Guide
- Are You Living by General Ghost (Jesus meets with Dan Cruz, they talk about Flintwood, the school athletic programs then Dan offers him a scholarship; Mariana tries to put in her new contacts when Brandon comes into the bathroom to talk.)
- Wild for You by Sleep Machine (Stef and Lena talk about having an adult night with all the children out of the house for the night; Brandon thanks Lou for giving him money then she apologizes for not being more supportive of him.)
- Nothing Will Ever Get Any Better by Unwed Teenage Mothers (Mariana arrives at the "pharm" party and runs into a crotchety bouncer, Mat helps her get in; UTM performs; Brandon & Lou watch UTM when the pharm bowl is passed around Lou takes some of the pills.)
- Whose Girl Are You by Unwed Teenage Mothers (UTM perform again; Mariana and Brandon talk about the party and not talking drugs when Mat arrives for him and Brandon to set up; Mariana and Mat talk before she runs to bathroom after having eye problems.)
- Top of the Rock by Amigaman (Amigaman play at the party; Mariana searches for the restroom and ask the bouncer for help, he directs to behind the dumpsters as the warehouse doesn't have bathrooms.)
- Light Years Away by Someone's Little Sister (Mariana begins to call Brandon or Mat when she hears Someone's Little Sister begin to play; SLS preforms; Mariana searches for a way out of the storage unit when she finds a girl passed out.)
- Cross Fire by Someone's Little Sister (Someone's Little Sister plays when Lou begins to feel the effect of the pills and begins giggle convulsively; Mariana continues to try get out of the storage unit when druggie girl beings seizing.)
- A Stranger Love (De Lux Cover) by Classixx (The DJ deejays at the party; Callie tells Brandon that Mariana called her then introduces him to Rafael as Mat arrives look for Mariana when the police raid the warehouse.)
- Worlds Apart by Joshua Radin (Callie and Rafael talk out the house about her situation with Lena, Stef and Robert and her lying; Lena and Stef discuss Jesus and Flintwood when Callie comes in to tell them she wants to live with Robert.)