All-New Halloween Spooktacular! - S1-E6
Trivia: When Pietro says he'll help the twins maximise their candy acquisition, one twin says "Kick-ass!" and Wanda repeats to herself "kick-ass." Both Aaron Taylor-Johnson, who played Pietro in Avengers: Age of Ultron, and Evan Peters, who plays "Pietro" in WandaVision and the recent X-Men films, both starred in Kick-Ass.
Trivia: The monster is punched up into space and he shouts out, "Hey! I can see Angel Grove from here!" Angel Grove was the fictional town that the original Mighty Morphin' Power Rangers series took place.
If This Be... M.O.D.O.K.! - S1-E1
Trivia: When M.O.D.O.K. and Austin are out on town, the places they visit make references to several other Marvel characters. The dragon that is serving them in the restaurant is Fin Fang Foom. The concert they are next shown to be attending is advertising Lila Cheney, who in the comics is a mutant who can teleport over interstellar distances. Lastly, the arcade belongs to Arcade, who is primarily an enemy of the X-Men. (00:10:27 - 00:10:58)
When in Rome - S1-E3
Trivia: In Sex And The City, when Carrie is talking about Natasha, she angrily says, "Say hi to Najinski or whatever her name is..." In this episode, in the will, she's named as Natasha Najinski.