Gun shots.
In the hotel scene when Bryan punches the woman in the face, they cut to a scene with Graham, Christie and Martin sleeping in bed afterward. When their sleeping you hear three, what sound extremely like gunshots go off. I thought this was Bryan shooting the woman. However the last time they show Bryan is walking out of a building with his band. Did he shoot the woman?
However I thought this movie was really really good, unlike everybody else on IMDb.