Tim Curry was initially cast as the voice of the Joker. After he recorded four episodes, his take on the role was deemed to be too scary, so the decision was made to re-cast, and eventually the role went to Mark Hamill.
When establishing Two-Face, the writers took the time to show his alter-ego first, Harvey Dent, in several episodes, so the audience could get to know him better. That way, they were more shocked at his transformation from the upstanding Dent, to the monstrous Two-Face. The writers believed this made him into one of the show's best characters, and his origin, one of the show's best episodes.
The characters of Gotham City Police Officer Renee Montoya and Joker's girlfriend and henchwoman Dr. Harleen Frances Quinzel, a.k.a. Harley Quinn, were created for the animated series, and later incorporated into the comic books.
All voice acting was, unlike most voice-over work, performed ensemble. This means that all the voice actors performed their lines in a room together, rather than at separate times in different locations. Mark Hamill was the only cast member allowed to perform his Joker voice while standing, to make it easier to infuse the character with the manic energy the role required. All the other actors did their voices sitting down.
To create the eerie nighttime feeling, the background painters used dark paper instead of the traditional white. This also allowed them to save time from painting large portions of black color as most of the scenes are set at night. The animators coined the term "Dark Deco" for this art style.
Since the debut of this series, various elements have been adapted into the regular continuity of the Batman comics. These include the series' most popular original character, Harley Quinn, and the show's origin for Mr. Freeze.
Harley Quinn's relationship with The Joker was intended as a Punch and Judy coupling, but with the roles reversed. She was initially a one-shot character, but audiences took to her. She was brought back for more, and the writers even took the time to sketch a comic-book origin for Harley, to make her seem more real.
Harley Quinn was initially created for one episode, and was added to it almost at the last minute. In season one, episode seven, "Joker's Favor", Joker was initially to disguise himself as a female model to serve as bait for a trap he was setting. Writers determined that posing as a woman would be below the Joker's ego, so they created Harley Quinn as his henchwoman for the episode to keep the disguise.
When it came time to bring the Penguin into the show, Batman Returns (1992) had just gone into production. Warner Brothers insisted the animated version should reflect the one in the film, but they weren't allowed to release any pictures. Bruce Timm had to draw sketches on the set of the film, and then adjust him accordingly for the cartoon. When the show did new episodes for Kids WB, it allowed the producers to go back to the original source material design, which allowed the character to operate under the guise of a respectable businessman.
After every single storyboard, FOX would send the producers a long single spaced list of restrictions about five pages in length, on things they could not do for example; no child endangerment, no open wounds, no blood, no heavy gun violence, no strangling or neck grabs, no alcohol references, and no smoking. The FOX network was really picky, not just about the censorship, but just in terms of content and story. The network had many opinions on what the producers should and shouldn't be doing. Nobody bothered them like that on WB where they usually got about two paragraphs of stuff they couldn't do.
For a long time, the producers wanted to use Firefly, a character that uses fire as a weapon, but FOX said no completely, because they did not allow any character to be threatened or harmed by fire. It wasn't until Batman moved to the WB, that Firefly was able to be used.
A potential story involving a Catwoman and Black Canary team-up was interrupted in mid-pitch to the FOX network by their demand, "Where's Robin?" When the writers asked if they could omit Robin from just this one episode, FOX obliged by omitting the entire story.
Commissioner James Gordon and Alfred Pennyworth, two of the most important characters in the Batman mythos, never exchange a word with each other throughout the entire series, even if they do appear next to each other in the same scene.
The show's first opening sequence is essentially a remake of the pilot used to sell the show to Warner Brothers. In the pilot, Batman foils a jewelry heist on a rooftop, and leaves the robbers tied up for the Police. The pilot can be seen as a special feature on Volume 1 of the DVD collection.
Robin's costume was modeled after Neal Adams' redesigned Robin costume, that Tim Drake wore in the comics, though the Robin symbol was changed to a regular non-italicized "R", to make sure people would know he's Dick Grayson. However, when Tim Drake was used, his costume was redesigned with a red, yellow, and black color scheme.
The FOX Network, on the false assumption that kids won't watch a kid's show, unless kids are in it, soon began insisting that Robin be prominently featured in every episode. When FOX changed the title to "The Adventures of Batman and Robin" for season three, they laid down the law. No story premise was to be considered, unless it was either a Robin story, or one in which he played a key role.
After fourteen years, "The Dark Knight's First Night", the rarely seen pilot promo reel developed for Warner Brothers by Bruce Timm and Eric Radomski, was included on the first DVD boxed set. Versions of the promo had surfaced in degraded bootleg form at comic conventions over the years, but was never intended for public viewing. Unfortunately, the actual Warner Brothers reel was not kept in the best condition either, appearing at around one minute and forty-five seconds in length, and having been converted from VHS. The original audio track was lost over time, and replaced with the show's main theme for the DVD.
This series debuted only three months after the release of Batman Returns (1992). It borrowed several elements from the Tim Burton films, including: Jack Napier as the name of the Joker's alter ego. The look of the Penguin. The Penguin's duck vehicle. Danny Elfman's theme. The design of Gotham City as a clash of styles and trends (for example, modern technology, but retro clothing).
Michael Ansara, who voiced Mister Freeze in the iconic, Emmy winning episode Batman: The Animated Series: Heart of Ice (1992), once uttered the words during this performance, "Revenge is a dish best served cold." This line has been called an "Old Klingon proverb" in Star Trek (1966), where Ansara once portrayed Klingon Commander Kang. He even threatened the Enterprise crew with the line, "You will die in the icy cold of space."
Paul Dini has said that Harley Quinn was partly inspired by seeing Arleen Sorkin wearing a harlequin's costume in her role as Calliope Jones, on an episode of Days of Our Lives (1965). As a result, Dini was subsequently inspired to cast Sorkin as the voice of Harley Quinn. In addition, Dini and Sorkin were college classmates together.
The 1992-1995 time period of Batman, is also known as "Radomski Era", because of Director and Producer Eric Radomski's involvement with this show and Batman: Mask of the Phantasm (1993). According to the documentary HBO First Look: Mask of the Phantasm (1993), it was Radomski who started using black papers, opposed to traditional white papers.
While the Tim Burton Batman movies influenced much of the show, an updated Batman animated series had been in development for almost a decade prior to the show's debut. One proposed pilot came to be adapted as an episode of The Super Powers Team: Galactic Guardians (1985). It was largely the success of Tim Burton's Batman (1989), which inspired the green lighting, and subsequent launch of the series.
Originally, Shirley Walker's Batman theme was going to be the theme music for the show, because Danny Elfman didn't want his Batman theme used for a cartoon. However, Elfman changed his mind once he learned the show would debut in primetime. Walker' s Batman theme became the DC Animated Universe's Batman's music, and was eventually used as the show's theme in the last twenty FOX shows, when the title was changed to "The Adventures of Batman & Robin".
Clayface, in this series, is Matt Hagen, but instead of being a treasure hunter, he's an actor, which is the occupational background of Basil Karlo, the original character to use the name Clayface in the comics.
At no point in any of the episodes is the title, "Batman: The Animated Series" displayed. However, in seasons three, four, and five episodes, the title "The Adventures of Batman & Robin" was displayed.
While working in this show, Bruce Timm and Story Editor Sean Catherine Derek strongly disagreed with each other. According to the book "Batman Animated" page twelve, Derek felt that Directors and Storyboard Artists of this show, were taking too many liberties with the scripts. Jules Dennis, Richard Mueller, and Derek wrote the original script of Batman: The Animated Series: The Forgotten (1992), but Timm made several changes to the script. According to Animato Magazine Issue #26, Timm put in the dream sequence with Bruce Wayne in the barracks, where multitudes of people are looking to Bruce for a hand-out, and he doesn't have enough money for them all, and they're surrounding him and suffocating him. Timm also completely changed the villain in the script, to a fat and revolting character, who constantly eats.
Debated was the inspiration for The Joker in the original comic book, 'The Joker' was almost identical in appearance to the main character in The Man Who Laughs (1928). Almost all episodes featuring The Joker are taken from the film.
Tim Curry was originally cast as the Joker, before he was replaced by Mark Hamill. Both would later go on to play villains on Criminal Minds (2005) Curry as Billy Flynn, a.k.a. The Prince of Darkness, and Hamill as John Curtis, a.k.a. the Replicator. Ironically three of the main cast from Criminal Minds would go on to play iconic villain and hero characters with Matthew Gray Gubler and Thomas Gibson playing villains The Riddler and Deathstroke in the animated movies Batman: Assault on Arkham and Son of Batman and Shemar Moore playing the hero Cyborg in the animated movie Justice League: All-Stars.
In Stu Hamilton's World's finest interview with Alan Burnett (one of the Producers of this show), he revealed that he is a big Alfred Hitchcock fan. He was able to get John Vernon to play Rupert Thorne on this show. Roscoe Lee Browne was also cast for the role of Dr. Wakati in the episode "Time out of Joint." In Topaz (1969), John Vernon played Rico Parra, and Roscoe Lee Browne played Philippe Dubois.
There are two characters whom share the same first name: Harvey Dent and Harvey Bullock. Harvey Dent is the former District Attorney of Gotham City whom becomes Two-Face, when half his face is left disfigured and Detective Harvey Bullock is a gruff, tough Gotham cop whom works under Commissioner Gordon and does not trust or like Batman and opposes him.
Mark Hamill (The Joker) is famous for portraying Luke Skywalker in the Star Wars films. Billy Dee-Williams whom played Lando Calrissian in those films portrayed Harvey Dent in Batman (1989). Star Wars: Episode III - Revenge of the Sith (2005) was released the same year as Batman Begins (2005) and Star Wars: The Last Jedi (2017) was released the same year as Justice League (2017) which Ben Affleck played Batman/Bruce Wayne.