Before Rob Paulsen agreed to take the role of Donatello, he first wanted to ensure that his co-star Barry Gordon, who voiced Donatello in Teenage Mutant Ninja Turtles (1987), was okay with it.
Karai: Booyakasha? What does that even mean?
Michelangelo: I don't know, but it's fun to yell!
In every episode, the last scene fades into a hand-drawn image, in Osamu Dezaki anime style.