The song at the end of this episode is called "Sweet And Lonely" by Chris Bowers.
Katherine McNamara and Olivia Nikkanen later both had roles in the CW's Arrowverse. McNamara plays Oliver Queen and Felicity Smoak's daughter Mia in season 7 of Arrow (2012), and Nikkanen plays the younger version of Kara Danvers' adoptive sister Alex in flashbacks in two episodes of Supergirl (2015).