Even with the best script, things can go wrong during the filming of a movie if safety measures aren’t regulated. And even when all of the rules are followed, an accident can still occur that leaves an actor bruised or broken for long after filming is over.
Sometimes an accident makes its way into the final film. During a scene in “Django Unchained” in which DiCaprio’s character angrily smashes his hand on a table, he cut his hand deeply, but continued the scene. The raw emotion (and gushing blood) that followed the accident was just too good for Tarantino to leave out of the film.