Christian Bale in Batman BeginsIt’s been 20 years since we were introduced to Christopher Nolan’s dark and gritty Batman trilogy.Leading star Christian Bale brought a whole new approach to the iconic superhero in 2005’s Batman Begins, which went on to be a huge critical and commercial success, kicking off an Oscar-winning franchise that would make its way into plenty of cinephiles’ top 10 lists.Also starring Cillian Murphy, Michael Caine, Liam Neeson, Katie Holmes and Gary Oldman, Batman Begins brought a rough edge to the Dark Knight’s origin story as he vowed to clean up crime in Gotham City.As fans will no doubt be returning to the movie to mark the anniversary, here are 11 behind-the-scenes secrets you might not have known about how the film was made…Before Christian Bale was cast