Watch the original short by Damien Chazelle that led to his feature script being produced.
Johnny Simmons (no relation to JK) plays the lead that eventually went to Miles Tellar. For me, Simmons was immediately recognizable from Scott Pilgrim vs The World. He has been in a number of films and we will see him soon in The Stanford Prison Experiment (2015 Sundance premiere).
The short is quite similar to the corresponding scene in the feature, which shows how effective it was as a calling card for Chazelle and his script. It also took the Grand Jury prize at Sundance in 2013.
NOTE: The video has been removed on YouTube.