The song that Glen (Josh Burrow) sings in the movie is called 'Amazing Grace'. This song was written specifically for the film by Ellis Paul, under the original title 'Saving Grace'.
The 5 notes in the ' Corner Bar Pictures' theme are D, E, F, A, C (Donahue Entertainment - Film And Cinema)
Dave Dunlap, the Director of Photography, was nominated for an Emmy for his Cinematography work on 'House of Cards".
Glen the guitarist, is recognizable on televisions 'Captain Morgan' commercials as Captain Morgan.