 Because of the films budget constraints, most all of the  performances were done in one or two takes (According to director  Rash) This let to some "happy accidents" of realism. For instance,  Busey refers to handwritten lyrics on his guitar when singing  "Mockingbird Hill", He flubs some of the song lyrics on the Ed  Sullivan show performance of "Maybe, Baby", Buddys vibrant concert  performance with Eddie Cochran was actually a "rehersal" that the  director decided not to film again, and Buseys guitar cord gets  wrapped around his leg during the final concert.