Sean Young was originally cast as Vicki Vale but broke her collarbone while filming a horse-riding scene with Michael Keaton. The scene was subsequently written out of the script when Kim Basinger took over the role.

The Joker says "better make it ten [minutes]", before heading up Gotham Cathedral. Exactly 10 minutes later, the helicopter flies into shot to get him.

Billy Dee Williams only took the role of Harvey Dent because he knew Dent will become Two-Face, a character he very much wanted to play. When Joel Schumacher was hired to direct Batman Forever (Batman 3), Williams asked to play the part but it was given to Tommy Lee Jones instead.

Here's a nice touch. Look at the picture of "Batman" the artist shows Knox (the one of the bat in a suit.) In the lower right corner of the paper is the autograph of Batman creator Bob Kane. Additionally, the artist is named "Bob the Cartoonist" in the credits.

During development, Alec Baldwin was set to play Batman and Tim Curry was set to play The Joker.

Back in the days before computer effects, giant painted backdrops were used, a few of these were used in the large scenes such as city hall and a few others.

In his hideout, Joker has a lot of pictures scattered around the room. After he cuts out Vicki's picture and starts waltzing around the room, you can see the same picture that appears around the room of a smiling man with crazy dark hair. The guy in those photos looks a lot like Batman director Tim Burton.

The scene that leads up to Jack Napier falling into the vat of acid is extremely similar to the climax in "White Heat."

In the scene where the goons announce that they are running Jack Palance's company, there are two statues in front of the building. These statues are also featured in The Chronicles of Riddick. They are the huge Necromonger monuments in the beginning of the film.

Robin Williams was considered for the role of The Joker.

Originally, Adam West, who played the titular role in the comedic Batman TV series, wanted to do the part again, but it was Michael Keaton who was approved by none other than Batman's creator Bob Kane himself.

Look carefully at the plastic surgeon's tools during the scene when Joker sees his face for the first time-they were previously used by Steve Martin's maniacal dentist in Little Shop of Horrors.

When Bruce Wayne is sitting in the BatCave there is a map of the Axis Chemical neighbourhood and a map of Gotham City. The first map is actually that of Capitol Hill, a neighbourhood in Burnaby, British Columbia (see Hastings Street on the south edge of the map, and Dollarton Hiway on the other side of the water). The other map is of Vancouver International Airport and part of South Vancouver, also in British Columbia.

Bill Murray was considered for the role of Bruce Wayne/Batman.

In the scene when there's the Joker fashion product commercial at the end we see a cartoon Joker head in a spiral circle. That's the same Joker on the cartoon Batman TV show.

Michael Keaton's casting was so controversial at first, it got a front-page mention in the Wall Street Journal.