Exterior scenes of Westview were filmed on Blondie Street on Warner Bros. Ranch before the neighborhood was demolished. The set was previously used for "Wandavision". Agatha lives in the house used in the TV-series A Feiticeira (1964).
The character of Agatha Harkness was created by Stan Lee and Jack Kirby for the Fantastic Four, making her debut in issue #94, released in October 1969. She is an ally of Marvel's first family and was the nanny to Reed Richards and Sue Storm's son Franklin.
First live-action treatment of a Marvel Comics character who does not have their own comic book series.
Kathryn Hahn's portrayal of Agatha Harkness is loosely inspired by the character's presentation in Marvel's Ultimate Universe line of comic books, which present her as younger with dark hair.
Showrunner Jac Schaeffer wanted Patty Guggenheim to reprise her role as Madisynn King from Mulher-Hulk: Defensora de Heróis (2022) for a cameo in this series, but "We were all banging our heads against the wall trying to figure out [how to incorporate her]... and it just didn't work. It was shoe-horning. And I had to let that go."