A single flaw in The Simpsons' sixth season has been discovered, hereby ruining it

“And Maggie Makes Three” is a lovely episode of The Simpsons, serving as a hilarious, heartfelt origin story for the animated clan’s youngest member. It also contains what might be the most glaring error in the history of a show that’s more or less managed to cleverly sidestep continuity questions throughout its 29 seasons.
Executive producer Matt Selman pointed it out on Twitter, sharing a screenshot that shows a pregnant Marge sitting before a very large portrait of the baby that is currently in her belly.
This prompted reactions from a number of Simpsons talents, including Yeardley “Lisa Simpson” Smith, who forgot the golden rule of blaming all errors on wizards.