Huge fans of the Beatles, the writer/creators, Vlad and Yuri, based the story on the famous Paul is Dead conspiracy theory.
Andrew Caldwell (Billy) learned to play drums for the show.
One of the show's writers/creators, Vlad Baranovsky, wrote a significant part of the soundtrack and is the lead singer on multiple tracks, including the intro track, WON'T YOU LOVE ME.
Three of the four lead actors - Drake Bell, Zach Villa and Emma Fitzpatrick - are all accomplished musicians. Each of them sings at least one song (and in many cases 2-3 songs) in the soundtrack.
One of the rugs is voiced by the director and co-writer/co-creator, Yuri Baranovsky.