I don't know if this has been covered already, but I am fascinated by the decision to use a keytar to attack Shredder. The (far superior to any work of film) Coming Out Of Their Shells tour has an accompanying documentary that you can find on youtube. In this tale of the meteoric rise of these musical wonders, it is extensively described that due to the turtles' lack of fingers they prefer to play a one-string bass. I think the keytar may be the only moment in the franchise of anyone thinking, "Shit, even ravenous kid fans knew that didn't make any sense. Let's fix it for The Ooze."