Visual Effects of Awesome: The episode gets a lot of love (in contrast to its more controversial sister episode) for nearly the entire episode being a love letter to the silent age of animation right about when the girls find out the Big Bad of the episode has kidnapped the Professor.
The Woobie: Max Von Nitrate is a villainous example, he wanted the Professor's nicer sounding voice because he was once a famous actor in silent films until technology moved on and sound started getting inserted in movies.
Sweet 'N Sour provides examples of:
Fanon Discontinuity: Due to its mean spirited nature towards the girls, some fans would like to pretend that the episode never happened.
Iron Woobie: The girls themselves; they take all the flack they get in stride and try all they can to stop the Fluffy Bunch.