A 'Simpsons' producer just noticed a blatant, laughable mistake on the show

It's not like the producers of The Simpsons are obsessed with continuity – in fact they play it rather fast and loose with the timeline on the show.

But, when executive producer Matt Selman spotted a pretty big continuity blunder on Wednesday, he thought it worth sharing on Twitter.

"Maggie is in photo on wall behind Marge telling Homer she’s pregnant with Maggie," Selman wrote alongside a screen shot from episode 13 of the sixth season of The Simpsons.

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Fellow Simpsons writer Al Jean was quick to respond to Selman's observation.

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Simpsons fans chimed in and discussed who they felt was to blame.

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Jean joked that the continuity blunder had led to mass firings on the show.

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Other fans came up with theories as to what might be the reason for the mysterious Maggie photo.

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Other observant fans pointed out that the exact same thing had actually happened before on the show.

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And of course, a fan had the perfect Simpsons reference for the moment.

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But honestly, over the course of 30 seasons, there's bound to be a few slip ups.