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.
Tenacious D: The Pick of Destiny (2006)
Ending / spoiler
Directed by: Liam Lynch
Starring: Ben Stiller, Jack Black, JR Reed, Kyle Gass, Ronnie James Dio
JB and KG have a rock off with the devil in which if they lose the devil will get to take KG back to hell to be his "little @$&%$." They win and the devil's horn is cut off so he is not complete and has to rteurn to hell. They take back the horn to their apartment in which they turn it into the bong of destiny and use it to write songs.
Conor B.
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Trivia: Actress Amy Adams makes a small cameo during the "Master Exploder" sequence. She is the woman who mouths "I love you!" to Jack Black, and is subsequently covered with the brains of the man whose head explodes.