My 2 cents about this whole reference thing: "Q-taro" is actually a reference to the Fujiko Fujio duo's manga Obake no Q-taro, about a ghost living with a family. If Wikipedia is to go by, this ghost was also referred as Q-chan (Kyuu-chan :) ), too.
...Also, highly possible, the Jojo reference thing from Part 3 is actually an Obake no Q-taro reference, too.