Before the end of the episode, a shot of Maggie is shown where she is dressed in Liberty Leading the People and holding a flag which reads "Je Suis Charlie" (I Am Charlie) in memory of the people killed in the shooting at Charlie Hebdo in France.
Booths at the circus include : Freaks and Geeks, a reference to the TV show Freaks and Geeks, which Judd Apatow is executive producer of. A booth of Drillbit Taylor(with a drill bit through his face cheeks), a reference to the movie character Drillbit Taylor. A booth of the 400-Year-Old Virgin, a reference to The 40-Year-Old Virgin movie and a booth with a man with the world's longest fingernails, which Homer breaks.
Sven Golly's name is a reference to Svengali, a fictional character in George du Maurier's 1895 novel Trilby.The word svengali refers to a person who, with evil intent, dominates, manipulates and controls a person.
Just before Homer is re-hypnotized to regain his adult consciousness, he tells Bart to "stay ten forever." The irony in this statement is Bart has been ten years old for the last 26 years.
The Final scene shows Sven Golly Imprisoned deep beneath the Police station in a isolated Plastic Prison exactly like Magneto's cell in the X Men movies.
Lisa performs the song Baker Street on her saxaphone for Homer and an audience of her stuffed toys. She previously played this song in Lisa's Sax.
When Marge explains to Homer about the time his thumb came off, it could have been a reference to Trilogy of Error when Marge accidentally chops off Homer's thumb.
Homer was also hypnotised by Mesmerino, a hypnotist who works at the restaurant The Pimento Grove. He hypnotised Homer into thinking he was twelve years old again. Homer then recalls a memory of him finding a dead body. 
Almost at the end of the episode, a small tape is shown, with a sad Maggie holding a flag reading "Je suis Charlie", a homenage to the Charlie Hebdo terrorist attack in Paris, France.