When Bruce and Dick head to the Bat poles, a clip from the pilot episode is used to show the book case revealing the secret Bat poles. This is evident as the bookcase prop was different in the pilot episode to the rest of the series (including this episode).
This is one of the very few times when a villain, having Batman and Robin (or at least one of them) in their clutches, actually thought to remove the masks and expose them.
As Chief of Police, O'Hara should know better than to give away evidence as souveniors, even if he didn't like the look of it.
Jose Ferrer and Gig Young were considered for the role of The Joker.
Cesar Romero refused to shave his moustache which gave him his career, so they had to cover it with makeup as well.
Notice that The Joker's henchmen are named after legendary comedians: Stan Laurel, Oliver Hardy, W.C. Fields and Ernie Kovacs.
Narrator: Could this mean curtains?? Will the identities of our Dynamic Duo be revealed to the whole world?? Is this the end of their career as crimefighters?? Can they avert disaster?? Answers...Tomorrow Night! Same Time, Same Channel!
The Joker: (Laughing) And now, people of Gotham City, the moment you have all been waiting for. (Still laughing) The grand finale! The climax of my performance! The zenith of my career! The unmasking of Batman and Robin the boy wonder!
In 1959, Cesar Romero had a run-in with another famous caped crusader, as Estevan de la Cruz, a guest character on the ''Zorro'' television series created by Walt Disney. Interestingly enough, the character of Zorro was the prime inspiration for the creation of the character of Batman.
Heath Ledger would go on to portray the Joker in the 2008 movieThe Dark Knightprior to his death on January 22, 2008.
Jack Nicholson played the Joker in the 1989 movie Batman.
The Joker's henchwoman Queenie originated in the comic books in the 1940s. In that story, as the Joker's cohort, she learned Bruce Wayne was Batman but was killed, taking the information with her.
This is the first appearance of the Joker.
This was the first Bat-episode to be adapted as a ViewMaster (#1003).
Writer Robert Dozier is the son of Batman Executive Producer William Dozier.
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