This slipup occurs on the episode where michelle and her friends start the mighty mutant super kids club. in the very beginning she and her friends are jumping on the beds. if you look a michelle's left foot her sock is missing. once she jumps off of the bed the left sock is still missing, then the camera goes to her friends then back to her. right then the sock appears on her left foot. then the camera turns again and comes back to her and the left sock is gone again!!!