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.
The title of this episode; "Superman's Pal" is an homage to the DC comic book; "Superman's Pal: Jimmy Olsen" which ran for 20 years from 1954 to 74. The comic book was created due to the popularity of the Olsen character in the TV show; "Adventures of Superman" staring Jack Larson as Jimmy Olsen.