The last time Malcom McDowell would voice John Corben/Metallo for this series. He would later reprise the role in an episode of Justice League Unlimited.
The last episode of the series where Superman operates solo. For the remaining episodes, he works with Aquaman, Batman or Supergirl. One could also say that this is the last time we see Superman operating solo in the entire DCAU as he later appears in Justice League and Justice League Unlimited where he's always working alongside League members.