Saved from Development Hell: The film was first pitched in 2002, started development in 2006, and went through 5 other directors before Genndy was brought. He was given the task of rewriting, redesigning the characters, and re-supervising the animation all in under a year. When he was made director, the film finally started to come together and was given a release date in 2012.
What Could Have Been: Jonathan was intended at one point to be the last descendant of Abraham Van Helsing, which would have created a even bigger conflict between him and Dracula. It is not known when this plot point was dropped.