Billy is 35 years old, as of this episode.
The Monarch's laptop appears to be an original-model iBook (circa 1999), with the Apple logo replaced with the Monarch's symbol.
The third of three episodes in which a character overtly says the name of the show.
First appearance of Dr. Z.
The photographs in the background of the Rusty's Day Camp opening are of a young Doc Hammer. Soul-Bot also makes an appearance due to them needing to remove a kid they couldn't find and (presumably) get a release form from.