Goof: Notice in the bridge dedication scene, the fake Commissioner walks to the left side of the bridge. But when he falls off the bridge it is on the right side.
Narrator: Holy midnight! The first minute of the new day...The everlasting end for Robin! Stick merciful cotton in your ears...! The death-knell sounds tomorrow...Same Bat-Time, Same Bat-Channel!
This is one of the only first-parter episodes in which the oft-repeated shot of Batman and Robin running into city hall does not appear. Instead, we see one of Bookworm's cronies watching City Hall from around the corner.
The 20,000-decibel super-amplified sound effect of Batman's Batcommunicator sound effect was previously heard on Season 1 episode Better Luck Next Time.
Before bringing Lydia Limpet to The Batcave, Batman uses of a can of Bat-gas for the first time. A can of Bat-awake won't be used until The Riddler's False Notion.
Title of Book: For Whom The Bell TollsThe Bookworm: Do not ask for whom this bell tolls, it tolls for thee.
The bomb left in the Batmobile was disguised as a a copy of the novel by Ernest Hemingway, For Whom The Bell Tolls, published in 1940 revolving around events during the Spanish Civil War. But this novel itself is an allusion to John Donne's Meditation XVII "No Man is an Island" which Batman himself makes reference to in the episode and which the Bookworm quotes near the end of the episode. John Donne's meaning is that death come to all humanity and is a loss to us all not just the one dying.