In this episode Andy explains that Otis is a "glue dipper over at the furniture factory."
Warren gives Otis a concoction to rouse him from his morning hangover. Andy gives him a similar drink (raw egg, Tabasco sauce, spices) in the episode "Dogs, Dogs, Dogs."
In this episode, Goober reveals to Warren that three hours is a long time to go without eating.
Warren meets Otis for the first time on Friday night, which indicates that this would have to still be Warren's first week in Mayberry.
Warren exposes his own ignorance of art theory when Goober places a blue tile into the white sail of his mosaic and gets accused of not having been taught about "complementary colors." Blue and white have nothing to do with each other in complimentary color schemes.