Clone Cadets - S3-E1
Trivia: Commander Colt watches Domino Squad do their test and says, "Start The Citadel challenge, version THX, variable 1138," which is a reference to THX 1138, another film by George Lucas.
Trivia: When Kyle is knocked into the airfield by Siniestro, he crashes into a Sabre jet. As he recovers, we read the pilot's name as Col. Hal Jordan. This is the name of the second, Silver Age Green Lantern.
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: When the Nazi General pushes a subordinate out of the blimp, he yells a Wilhelm scream.
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: 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".
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.
Steve Gets the Sniffles - S2-E1
Trivia: During a mailtime segment, there's a rare Blue's Clues poster visible.
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.
Trivia: The Doctor comes to Nevada in search of "A bowl of chili. The sort you only ever got in an American diner before 1962." During the 1960s, Chasen's Restaurant in Hollywood made a chili that became highly sought-after by celebrities (Elizabeth Taylor had some flown to Rome when she was making "Cleopatra."). Diners started changing their chili recipes in attempts to duplicate Chasen's secret recipe. This is why The Doctor had to go back to the 1950s in search of a bowl of old-fashioned American chili. (00:01:30)
Trivia: This is a flashback episode and contains only four minutes of new material. The remaining 18.5 minutes is footage from the episodes "The Most Special Agent", "Hi-Jacked" and "Colonel McClaine".
The Return of the Beast: Part 1 - S1-E1
Trivia: When we see the flashback of the accident that caused Bruce Banner to become the Hulk, at first we see the Hulk colored gray and then slowly turn green. This is a reference to the comics, in which the Hulk was gray in his original appearance.
Rise of the Blue Beetle! - S1-E1
Trivia: Near the beginning, when Paco is flipping through the stations, you see a stand-up comedian and he says "it's called The Aristocrats." This is the punchline to one of the world's dirtiest jokes. The closed caption (on the HBO MAX version) says "to get to the other side."