At The Pimento Grove, there are pictures showing characters and guest stars including Birch Barlow, Barry White, Bette Midler, Brooke Shields, Stephen Hawking, Rainier Wolfcastle, Johnny Carson, David Crosby, Leonard Nimoy, Anthony and Flea from The Red Hot Chili Peppers, Ron Howard, Paul McCartney, Betty White and Bumblebee Man.
In this episode, it hints that Waylon Smithers, Jr. became gay after Mr. Burns lie about how Mr. Smithers Sr.. died. Mr. Burns says that he told Mr. Smithers, Jr. that his father was killed by women in the Amazon, and says that it had no effect on him. Then, Waylon uncontently and hesitantly agrees.
At the end of the episode, Homer is placing Smithers Sr.'s skull in a memories box on the coffee table. Moe arrives, and when he sits down, the memories box is gone. After a close-up of Moe's face, the table is gone.
In this episode, Waylon Smithers, Jr. was an infant and Homer Simpson is almost a teenager, yet in Bye Bye Nerdie, Smithers was around Homer's age when Homer reminisced about his "bully problem" in grade school. The body may have been there for a number of years by the time Homer found it.
When young Moe shoots Fat Tony, it was clear that he has acne. However, when Fat Tony and his gang runs for their lives, Moe's acne is nowhere in sight.
Fat Tony and his group are a lot older than Homer. Fat Tony should at least be 20 by this point.
When Homer first discovers the body of Smithers Sr., the body had glasses and hair but when its face is shown, the body has no glasses or hair.
When Homer explains how he almost made it across Springfield Gorge, Lisa informs him that everyone is tired at the memory, a reference to its repeated showings in other episodes before.