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.
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."