Time Machine

During the filming of this episode Al was hit in the head by the boom mic and actually knocked him to the ground for a few seconds.

When Weird Al is performing "Yoda", he goes near the guitarist in the white shirt. The second time he does this (almost two minutes into the performance), the guitarist is standing upright looking at the body of his guitar. But when the camera view cuts to a wider shot, he's suddenly leaning back with his knees bent and is looking toward the ceiling.