In the first episode of Disenchantment (2018), during the wedding scene, right before Elfo interrupts the ceremony, there’s a look of the inside of the temple in which we can see all the guests and main characters:
As you can see, most of the wedding guests are doubled. This happens only at this particular scene (not a single frame but a few seconds); at previous parts of the wedding we can see the guests from the same angle and no one is repeated:
How does an issue like this happen? I thought the animation was done by computer and not the classic transparent sheets/cels.