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Published 11:58 6 Sept 2018 BST
Updated 12:56 6 Sept 2018 BST

Anyway, the mistake is quite an obvious one and does make you wonder how nobody has actually noticed before.
As you can see from Matt Selman's tweet below, Maggie is clearly visible in the portrait hung on the wall, despite not actually being born yet (as Marge is quite visibly pregnant, and Homer is quite visibly panicking).
https://twitter.com/mattselman/status/1037147366564851712
Good news though, as showrunner Al Jean took the swift action necessary, promptly (joked about) firing 17 employees.
https://twitter.com/AlJean/status/1037202449893941248
Fortunately, one fan had the perfect explanation for the gaff, citing a Comic-Con scene featuring Xena: Warrior Princess:
https://twitter.com/Rewster7/status/1037198349663920128
(Or it could just have been baby Lisa. They are related and have exactly the same hair. But whatever.)
Regardless, there is another instance of The Simpsons timeframe completely going out the window in the same episode, as you can see in the shot below.
This time it is clearly Lisa on the wall, but you will notice that Homer still has a full(ish) head of hair, meaning that this was before the birth of Bart.
In fact, this is the exact scene when he finds out about Marge's first pregnancy and the impending arrival of "the boy", as he runs upstairs to hide in the bedroom and pull his hair out.
If the above does actually irritate you, then, well, I'll just leave you with one final scene.
https://www.youtube.com/watch?v=h1nD4o3zTfoExplore more on these topics:

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