Herman's written a book called A Farewell To Arm (a reference to A Farewell to Arms, by Ernest Hemingway). Nelson's written one called i, Bully (a reference to i, Robot by Isaac Asimov). And Willie's written a novel called Postcards From The Hedge (which references Postcards from the Edge by Carrie Fisher).
This is the 10th episode to not have the Couch Gag, Billboard Gag, and the Chalkboard Gag. It is also the second episode in a row to not have the gags.
In the flashback of this episode, while Homer was at age six (after his mother left) Chief Wiggum was part of a big brother program and a dog catcher during Homer's youth. However, when Homer was nine in Mother Simpson, Chief Wiggum was a younger security guard for Mr. Burns' germ warfare laboratory. Furthermore, Homer and Clancy are seen to be about the same age in "The Way We Weren't" and "Springfield Up", while here Homer is a child and Wiggum is an adult.
In the flashback of this episode, Herman loses his arm while trying to hitch a ride to piano school, when the Springfield Animal Control Truck speeds by. However, it was implied in both Homer's Odyssey and Bart the General that he lost his arm while hanging it out of the school bus window. Even though he originally referenced this as a warning to Bart, he apparently wrote a memoir about it.
In the flashback the children that are seen are kids that are regularly seen at Springfield Elementary School. These children were obviously not born when Homer was a kid.