Continuity mistake: When Amy sets the coffee maker back down on the counter, the pot is facing to the right. It switches to face the left later in the scene and then back to the right.
Continuity mistake: When Amy and Jonah open the small door to the dressing room, the man pulls his pants part of the way up and is holding them. When the camera angle changes, you can see him in the mirror and his pants are all the way down and his hands are at his side. It switches back and forth based on the camera angle.
Delivery Day - S4-E5
Continuity mistake: Jonah is wearing the VISITOR tag. He doesn't even move it but the tag switches side. (00:01:50)
Chosen answer: He's just gained weight. It looks like he slowly started gaining more weight around 2006 or so. In "Kids in the Hall: Death Comes to Town" (2010) he's noticeably heavier than his younger days (he was on SNL 21 years ago). By the time he was in "Man Seeking Woman" he looks very similar to how he looks in "Superstore."
Bishop73