Behold the Negative Zone - S1-E12
Trivia: When Blastaar comes through the Negative Zone into the Earth dimension, Thing remarks that Blastaar makes him look like Brian Austin Green. Brian Austin Green was the voice of Human Torch for the first season of this show. (00:11:18)
Tolerance Is Extinction - Pt 2 - S1-E9
Trivia: When Cable scoffs at the uniform Cyclops gives him to wear, Cyclops asks if he was expecting black leather. This is a reference to the first X-Men film, when Wolverine scoffed at the X-Men's black leather uniforms, only for Cyclops to ask him if he preferred yellow spandex instead.
Trivia: Kingpin is voiced by Michael Clarke Duncan, who also played him in the live-action 2003 "Daredevil" movie.
Fiend is Like Friend Without the 'R' - S1-E4
Trivia: Nergal is the villain introduced in this episode. "Nergal" originally was the name of the Babylonian God of Fire and Guardian of the Underworld. In the Bible, he is one of the demons allied with Satan himself. In the series Nergal is associated with the underworld and fire.
Trivia: There are a lot of Greek references. Cerberus, Tartarus, a messengers boots (Hermes reference) and the princesses. Twilight is the Greek word for friend love, or Philia. Cadence is Eros, or romantic love. Celestia is Agape, the love God has for mankind. Well, Celestia is kind of a god. Luna is Storge, love of a mother and child. This works because she has helped Scootaloo and Sweetie Belle in a motherly way. She was a mentor to both of them.
Trivia: When the Nazi General pushes a subordinate out of the blimp, he yells a Wilhelm scream.
Trivia: One of the girls in Wayne's Missing Children's files is Annie, Clayface's split-off clone from The New Batman Adventures episode "Growing Pains".
Through the Rabbit Hole - S2-E1
Trivia: The boy's comment, "Everybody is kung fu fighting" at the ruined school dance, refers to Carl Douglas' song of the same name from 1974, two years before this episode takes place, following the fledging martial arts craze in America. This song has recently (in a slight variation) resurfaced in Kung Fu Panda.
The Big Question / The Big Answer - S3-E11
Trivia: At one point in this episode, Hefer says "please put me down Mr. Crabs." Most of the crew from this show went on to make SpongeBob SquarePants a few years after Rocko ended, which has a character named Mr. Crabs.
Trivia: Even though Paul Lynde was the voice of the Hooded Claw, his name did not appear in the closing credits throughout the series. Lynde's agent recommended his client not be credited for his voice role, as the feared it would hurt his credibility as a live-action performer.
Trivia: The song playing on the radio when Rosebud breaks in, 'I'd Take a Bite of the Moon For You,' references the episodes 'Alone Together' and 'Tick Vs. Chairface Chippendale.' The song playing when El Seed breaks into the botanical gardens is a jazzy version of the show's theme song.
The Crab with the Golden Claws: Part 1 - S1-E1
Trivia: When Kuraki attempts to put the letter in Tintin's mail box before getting ambushed, the mailbox next to Tintin's is labelled Herge, the creator of Tintin. (00:05:40)
The Scorn of the Star Sapphire! - S3-E5
Trivia: After freeing Miss Taylor from the grip of Star Sapphire, Green Lantern encases her in a green energy box and flies her away. The box is shaped almost exactly like a shuttle craft from Star Trek. (00:15:50)
Pink Arcade / Life With Feather (pilot) / Pink S.W.A.T. - S1-E2
Trivia: Pink Arcade: When the Pink Panther carries the bowling bowl to the table, look behind him and you can see the back glasses of two pinball machines spell out the name "Yakutis" - a reference to the long-time DePatie-Freleng layout artist and story man Tom Yakutis.