When Stevil raises his arms to begin his dance, his arm rod is briefly seen. However, this is not exactly a goof as the majority of the episode was simply a dream.
After Steve picks up Stevil to throw him in the refrigerator, in the far right corner, the stunt double for Harriette's jack-in-the-box body is seen, in which it is merely a stuffed jack-in-the-box body with a spatula on top. However, this does not exactly count as a goof as the majority of the episode was merely a dream.
The style of the handles on the refrigerator doors change when the camera angle changes to directly behind Steve vs. being to his left side.