Development Hell: Daredevil: End of Days, a miniseries depicting the hypothetical deaths of Daredevil and his "biggest secret", was in development since at least 2009. Thankfully, the series is finally being released starting late 2012.
Saved By The Network: The title had been faltering since Marv Wolfman left the title. By the time Frank Miller had become penciler, sales were getting so bad that other executives advised Jim Shooter to cancel it. Shooter disagreed, having (correctly) guessed that Miller would revive interest in the title.
According to Shooter, Miller wanted to quit the title shortly after becoming penciler due to his dissatisfaction with then-writer Roger McKenzie. Shooter managed to talk him out of it, and editor Denny O'Neil later promoted Miller to writer.
Executive Meddling: Why the theatrical version was met with a mixed reaction, but the director's cut was more warmly received. Fox smelled potential spin-off with Elektra, so an entire subplot concerning Matt Murdock's "lawyer by day" persona (with his case eventually leading him to the Kingpin) was removed completely. His internal struggle with his vigilante justice clashing with his faith additionally take a backseat to increased screen time for Elektra and their love angle, and the film cut down on the intended Darker and Edgier tone. As a result upon its release, Daredevil nearly became the first film to not cross the $100 million domestic barrier after a $40 million opening, and Elektra completely tanked. Thankfully, the director's cut Set Right What Once Went Wrong.
A different form occurred on the DVD release, where both the cast and crew insisted that an Audio Description be included, making it one of the first films to do so.
Fake Nationality: The Greek-American Elektra Natchios is played by very not-Greek Jennifer Garner.
Ben Affleck does not look back on this experience fondly, stating that wearing a costume was "a source of humiliation". Considering he's taking up Batman's cape and cowl, though, it may have been the backlash from the Hollywood Hype Machine more than anything.
Averted with Writer/Director Mark Steven Johnson - You would expect him to dislike the theatrical cut of the film due to Executive Meddling that left an entire subplot on the cutting room floor, but on the Daredevil: Director's Cut DVD, he states that whilst he likes someone of the scenes added to the theatrical cut, he feels the Director's Cut was a superior film due to keeping various elements cut from the original release.
Romance on the Set: Affleck was still involved with Jennifer Lopez and Garner with Michael Vartan at the time, but after those relationships ended, Affleck and Garner became happily married with children.
What Could Have Been: The director's cut was intended to be included on the original DVD release, but ultimately the idea was dropped due to lack of disc space.
Ben Affleck was going to play Bullseye, but landed the lead role. Had this happened, it would probably make the scene where Bullseye guts Elektra and interesting topic for their kids.