Trivia: The all-white appearance of the reassembled Vision shown in the mid-credits scene is a nod to his look in a 1989 comics storyline called "Vision Quest," in which he was rebuilt without his original memories.
Phaneron
Trivia: When Elizabeth Olsen says "Previously On WandaVision" at the start of every episode beginning with episode 2, her voice gets progressively less enthusiastic.
Phaneron 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." She sounds almost confused, but might merely be disapproving of the language, either way this is either a nod to, or who knows, maybe even may connect in-universe to the fact that 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.
Jon Sandys All-New Halloween Spooktacular! - S1-E6
Trivia: Pietro makes various hellish references which tie into fan theories that what's going on in Wandavision is the work of a demon, quite possibly Mephisto: "Unleash hell, demon-spawn" and "damn it, if Westview New Jersey isn't charming as hell."
Jon Sandys 
Chosen answer: The living painting is taken straight from the Family Ties intro.
BaconIsMyBFFAh, that makes sense - I first saw this one on Youtube, which at a guess was the first season or an early version? https://www.youtube.com/watch?v=GPRdtO6UKD0. But yeah, this is exactly right: https://www.youtube.com/watch?v=ip1szfz9nZ8.
Jon Sandys