Rosa Parks was originally drawn as one of the protesters at the courthouse. But she was deleted due to her death just weeks before the air date. Parks can be seen briefly in the background at the celebration in front of the courthouse.
The line near the end of the episode in which Huey narrates "...Vexed. Yeah, vexed is a good word." is based off a line from Lord Chronos in Justice League Unlimited in the episode "The Once and Future Thing: Part 2"