ADV Films dubbed and initially had the license for the series back in 2002. FUNimation rescued it and re-released it in 2011. Strangely, they did not rescue Puni Puni Poemi, even though there are a lot of extras involving it in the DVD release that Funimation kept.
The voice of Excel was so impossible to control, original VA Jessica Calvellolost her voice during recording. You could even hear her voice breaking in the first episode. This is why Larissa Walcott replaced her in episodes 14-26. Even after being released from recording, Calvello was sidelined for a few years, and wouldn't work in another Texas based dub until 2013.
This is one of the earliest anime shows to utilize digital coloring over hand-painted cels. This is noted on in Episode 17 ("Animation USA"), in which one of the secondary characters is tasked with a job of hand-painting animation cels to be sold on the black market.
The Danza: The anime stars two Excel and Hyatt lookalikes named Kobayashi and Mikako, who are played by Yumiko Kobayashi and Mikako Takahashi. Also, Nabeshin.