On the XOXO announcement page for Ethan Shaw being added to the lineup, the details say it is due to a "last minute cancellation of Michael Brun," who is the real life artist that created Ethan's track "All I Ever Wanted." A few of the other artists listed in the lineup are the real artists of other tracks from the Soundtrack, such as Hayden James and The Mambo Brothers.
The song played on the bus is 'Beats Knockin' by Skrillex. This is ironic because the bass drop was programmed by Skrillex on a party bus.
During the beginning when Ethan is on Skype, "Graham Phillips" (the actor who plays Ethan) can be seen as a contact.