• Mark Brown's face remains hidden until "Good Luck, Adam Williams".
    • His face is revealed to be bald, with a small black beard, and resembles a human version of Dark Danny with no hair.
  • Originally, Mark Brown was to be voiced by James Woods, but WikiaIvan1997 decided to have Brown being voiced by Nolan North.
  • Mark Brown wearing a trench coat and a fedora hat is a reference to the 1987 Teenage Mutant Ninja Turtles cartoon series and the 1990 film, where the Turtles would sometimes wear a trench coat and a fedora hat to disguise themselves.
  • After his failed marriage with Mandie, Mark dated Ms. Doombringer before his death.
    • In "Doombringer and Crocker", it is implied that Doombringer didn't like Mark Brown, and his spying skills were lousy, as she hired him as a spy to reveal fairy godparents.
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