During his heart-to-heart with D.J. and Kimmy, Max confesses that his new classmates called him "an extra on Young Sheldon." Oddly enough, the actor who plays Max, Elias Harger, has a younger brother, Isaac Harger, who played 8-year-old Leonard Hofstadter on an episode of "Young Sheldon" A Swedish Science Thing and the Equation for Toast (2019).