Rick created a device that seemingly reset time a few seconds back, allowing Morty the ability to not only go back and erase embarrassing moments – or to create them for others – but also to reverse his own death.
(Amusingly, Rick wasn’t interested in the concept merely because it was something that Ant Man and the Wasp could figure out.)
While not as odd or ridiculously convoluted as some other recent episodes, Rick and Morty’s “The Vat of Acid” riffed on time-travel-esque do-overs without needing to actually use time travel.