Continuity mistake: When JB dreams about singing "Master Exploder" in the small bar, he points at one guy in the audience and literally blows his mind. When he starts pointing you can not only see JB's face, but also how his elbow is in a slight angle. In the next shot the camera shows the guy JB is pointing at and his elbow is completely stretched. The views change several times and the angle of his elbow changes after every cut, until the guy's brain is finally blown out.
Continuity mistake: As Jack and Kyle are walking up the "Guitarway to Heaven" in the Rock Museum, they vary between marching completely in synch with each other and out of synch. They are still walking directly next to each other, so it is not due to one of them changing their pace.