This week’s Rick and Morty season 4 (opens in new tab) adventure "The Vat of Acid Episode" sure wasn’t shy about advertising its headline act – the Vat of Acid played a central role in the episode’s universe-shifting shenanigans. Morty’s ‘save point’ gadget also featured a pair of well-hidden Easter eggs, referencing both The Simpsons and South Park.
Both Rick and Morty Easter eggs appear after Morty starts messing around with Rick’s invention, which allows his grandson to save his place in time and go back to it with a simple button press.
One of Morty’s first acts is to help an elderly man. In the background, you might see a distinctive green and orange stained-glass window. Yep, that’s almost certainly a nod to Springfield and, specifically, Moe’s Tavern (as spotted on Reddit).
Later, in the extended sequence featuring Morty falling in love with an unnamed woman and ending up in a plane crash, one of the survivors has a blue and red beanie on, the exact same design worn by South Park’s Stan Marsh.
As we find out, Morty’s button presses actually caused a multiverse split, sending several dimensions’ worth of Mortys to die. That also means Rick and Morty, briefly, may have actually spent time in the universes of The Simpsons and South Park.
- Here's how to stream Rick and Morty online (opens in new tab)
But the animated crossovers didn’t end there. Rick even finds time to take a meta jab at the season 4 episode’s premise, saying it’s something that has already been done by Futurama. Which is true: the series finale had a Time Button, which rewound time by ten seconds every time it was pressed.
Original or not, it certainly ranks up there as one of the series’ most captivating episodes – with more than enough Easter eggs to warrant repeat viewings.
For more from Springfield, South Park, and wherever the hell Rick and Morty live, check out these best-of lists...
- The best Rick and Morty episodes, ranked! (opens in new tab)
- The 25 best Simpsons episodes you should choo-choo-choose to watch (opens in new tab)
- The 25 best South Park episodes, mmkay (opens in new tab)