Is that an animation error with Homer and his mug?

It’s the episode where homer predicted the apocalypse. He Made a mistake the first time, so nobody trusted him, so only him could go to heaven.

Because of his mistake, Moe sold his bar that became a sushi bar, and at the end of the episode, Homer asks god to have bar’s moe back to normal (and to cancel the apocalypse). This is the final scene / last supper.

Joke is obvious, I think: Last Supper.