Playing Against Type: The director of the anime version, Hiroaki Sakurai, is mostly known for directing cute series like Di Gi Charat, so directing a series starring a bunch of decidedly un-cute delinquents was a radical departure for him. However both series relies on gags and Di Gi Charat sometimes feature un-cute characters.
Some of the Japanese voice actors in the cast have shared credits in other series directed by Hiroaki Sakurai, especially in the Di Gi Charat franchise. Besides cameos voiced by Asami Sanada (Dejiko), Megumi Hayashibara (Piyoko), and Miyuki Sawashiro (Puchiko), there's also Ryo Naitou (Takeshi, Paul in Di Gi Charat Nyo) as Takenouchi, Norihisa Mori (Yoshimi, John in Di Gi Charat Nyo) as Hokuto, Yuji Ueda (Abarenbou) as Ishikawa, and Mika Kanai (Kinako Ankoro in Di Gi Charat Nyo) as Mechazawa Beta.
The English dub cast share a lot of people that were involved in the Gantz dub. It's easy to count who wasn't in Cromartie.