When Wanda accidentally smashes a plate into Vision's head, he jokes about his wife and her "flying saucers," and she comments back about his "indestructible head." Considering that Vision died after having the Mind Stone ripped from his head, it's a dark joke to kick off the series.
Vision's work tie has a visual reference to his comic-book alter ego! In Tom King and Gabriel Hernandez Walta's Vision, whenever the character dresses as a human, he wears a tie clip that emulates the diamond pattern on his chest.
Vision's boss, Mr. Hart, is likely named after comic creator Steve Englehart, who created 1985's The Vision and the Scarlet Witch with Richard Howell, a miniseries that heavily influenced WandaVision.
When Wanda magically saves dinner, the bottle of wine she pours from is Maison du Mépris, which translates to house of contempt or scorn. As fans have pointed out since the trailer drop, this seems like a reference to the House of M comics storyline in which Wanda bends reality into a new world ruled by her family.
The Stark commercial break refers to two things: Avengers icon Tony Stark and his part in Wanda's dark past. As Wanda and her twin brother, Pietro, explain in Avengers: Age of Ultron, their parents were killed by an explosive Stark Industries device, leaving the twins trapped under rubble. The Maximoffs were trapped by a Stark Industries shell for two days, expecting it to detonate before they get rescued. Even though Wanda eventually fights beside Tony in the future, there's still some trauma from that experience and her brother's death. If it weren't for the Starks, Wanda could have been a completely different person.
The episode closes with a mysterious observer watching the "show" and taking notes on a pad with the logo of S.W.O.R.D. on the cover. For those who don't know, S.W.O.R.D stands for Sentient World Observation and Response Department and is a subdivision of S.H.I.E.L.D. It's a counterterrorism and intelligence agency that deals with extraterrestrial threats to world security. Expect to see them around more.