The singer of the song "Haven't You Noticed I'm a Star" is played by Olivia Olsen, who plays Marceline the Vampire Queen in another quirky, musical Cartoon Network series, 'Adventure Time.' She would record the version of the song that appears in the "Steven Universe" soundtrack album, which can be heard on the background in a scene where Sadie listens to it on the radio.
The version of the song "Haven't You Noticed I'm a Star" that appears on the episode, which was performed by Zach Callison and Kate Micucci, was not included on the "Steven Universe" soundtrack album.