Near the end of the West Coast version of the episode, Homer states that, "To prove that we're live, the Texas Rangers beat the Toronto Blue Jays on a technical knock out." Hours before the episode aired, Rangers second baseman, Rougned Odor punched Blue Jays right fielder Jose Bautista in the face during the eighth inning of the game.
When Homer's "mind explodes with premises", the woman siting on the chair in the "Philosophy: Objectivism" section is Ayn Rand, who was the creator of the philosophy Objectivism.
Bart knocks down the Fox Studios Secret Bunker walls, revealing it's on The Simpsons living room.
Ralph's treehouse appeared on the September issue of the Treehouse Beautiful magazine. This indicates that the begining of the episode takes place in September. This also indicates that Ralph's birthday is in, or at least close to September.