The Batman costume weighed 90 pounds; with the material being rubber, the entire body suit weighed 50 pounds plus a 40-pound piece rubber cape attached to the headpiece.
The Batgirl costume weighed 50 pounds.
The Robin costume weighed 50 pounds the same as the bat girl costume.
Anthony Hopkins was also considered for the role of Mr. Freeze.
Hulk Hogan was Joel Schumacher's third choice to play Mr. Freeze.
A new form of light foam rubber was used to make the superhero costumes. This helped the costumes weigh less than on any other Batman film, but they ripped and tore very easily.
Batgirl had a full-head costume designed for her much like Batman's (complete with pointy ears) in this movie, but it was rejected in favor of letting Alicia Silverstone's hair flow freely (except in one scene where she wears it as a crash helmet). Batgirl action figures designed for the movie reflect the full-head costume, before the toy makers were informed of the change.
The sign on a club reads "The Head Room" just before the scene in which Alfred's computer likeness talks to Barbara in a manner resembling Max Headroom.
During the scene where Batman and Robin bid for Poison Ivy, Batman pulls out his credit card. Its expiration date: FOREVER (a reference to Batman Forever (1995)).
Dr. Jason Woodrue appeared in DC Comics as another plant themed super-villain, as himself and as The Floronic Man.
Dr. Woodrue creates Bane with what he calls his "Super Soldier Serum". This is a reference to the origin of the Marvel Comics character Captain America. Created in the early 1940s (under Marvels's previous incarnation as Timely Comics), Captain America was Steve Rogers, a man too frail to enlist to fight in World War II. He agreed to subject himself to the Super Soldier Serum which heightened every ability and sense to the highest human limits. Of course, as these things go, the doctor who created the formula was promptly killed and Captain America would be the only Super Soldier. Despite Timely/Marvel having been a somewhat popular line at the time, Captain America was wildly succesful, rivaling Superman, Captain Marvel, Batman, and Wonder Woman in popularity.
In the original theatrical trailer, Mr. Freeze says the line, "Button up, boys. A storm is coming." That line is not present in the final film.
'Julia Roberts', Sharon Stone, and Demi Moore were all rumored to be in the running for the part of Poison Ivy, before Uma Thurman was cast.
Joel Schumacher once said in an interview that if Arnold had not wanted to play Mr. Freeze, Sylvester Stallone was his second choice.
Arkham Asylum was originally "made up" by horror writer H.P. Lovecraft, to use in his stories (and was located in Arkham, not Gotham City).
In the evidence room at the prison where Freeze is held and before Bane breaks in, both the Riddler's and Two-Face's outfits can be seen.
Pat Hingle (Commissioner Gordon) and Michael Gough (Alfred Pennyworth) are the only actors to appear in all four of the Batman films.
One of three movies to feature two future United States Governors acting in the same film. Jesse Ventura, elected Governor in Minnesota in 1998, and Arnold Schwarzenegger, elected Governor of California in 2003. (The other two films were Predator (1987), and The Running Man (1987). All three of these movies featured Ventura and Schwarzenegger.)
The computer in Alfred's room is a 20th anniversary Macintosh built by Apple Computer.
In an interview the cast members were asked what item from filming they would like to take home with them. Arnold Schwarzenegger said that he would be taking Mr. Freeze's armor home, Uma Thurman said that she wanted Ivy's floral throne, and Elle Macpherson said that she just wanted a cap or something with the "Batman & Robin" logo before anyone else. When asked, George Clooney said he wanted Elle Macpherson.
During shooting, George Clooney visited his friends on the set of "ER" (1994) in full costume.
George Clooney injured his lower leg playing basketball, while shooting Batman & Robin (1997). Because of this, he needed to cut the boot off of the Bat-suit in order to wear a cast. You can tell when his leg was injured from his limping while inside the freeze rocket.
When Batgirl sneaks to the motorcycle contest, one of the gangs there are dressed like the main characters in Stanley Kubrick's A Clockwork Orange (1971). At the same time, the background song is "Fun for Me", performed by Moloko. Moloko is Nadsat (Alex de Large and his droogs' language) for Milk.
Rated #5 in Entertainment Weekly's Top 25 Worst Sequels Ever Made (2006).
Patrick Stewart and Anthony Hopkins were both considered for the role of Mr. Freeze till Joel Schumacher decided that Mr. Freeze must be "big and strong like he was chiseled out of a glacier".
The film did so poorly in the box office that Warner Brothers canceled the fifth Batman film, "Batman Triumphant". Had the film been made, the main antagonists would have been the Scarecrow, the Man-Bat and Harley Quinn (for this story, Harley Quinn would have been the Joker's daughter instead of his on-and-off lover; and at the time, Madonna was being considered for the part) and a prolonged sequence would have involved the effect the Scarecrow's fear gas has on Batman: a return of the Joker (with Jack Nicholson making a cameo).
The villainous character Bane was created by comic book writer Chuck Dixon and artist Graham Nolan.
Val Kilmer was ask if he wanted to play Batman again but by his own admission, was not interested.