Box Office Bomb: The film was budgeted at $110 million not counting publicity, and it only made back $112 million worldwide. This is mainly due to an extremely poor marketing campaign that, in assuming that all audiences were familiar with the novel, not only made the story rather unclear but suffered from uncertainty about its target audience, and the tight competition it faced from Thor: The Dark World. The backlash the film received from the LGBT community due to Card's less-than-favorable views on homosexuality and gay marriage did not help Lionsgate one bit, despite director Gavin Hood and co-star Harrison Ford stating repeatedly that they support gay rights.
Development Hell: The film was mired there for decades. Unusually, Card was partially involved in keeping it there, as he preferred having no film than having one with a poor script and a bad child actor in the main role.
Card: My favorite thing about the end of 2013: I will never again have to answer questions about when the Ender's Game movie will come out.
Enforced Method Acting: The film was shot in sequence with Ford keeping his distance from Butterfield and the other kids at first so that their being in awe of The Harrison Ford (as well as their physical growth) would work for rather than against the story.
Executive Meddling: Ender's Shadow was originally titled "Urchin". That title was re-included as that of the first chapter.
An accidental example: Card intended for only Speaker For the Dead and Ender's Game to be written. His agent accidentally pitched them as "the Ender trilogy", and Card decided to use the opening to write Xenocide.
Inspiration For The Work: Orson Scott Card got the idea for Ender's Game as a kid, when he tried to theorize what the military of the future would use to train soldiers in space, thus imagining the Battle Room. That manifested into the original short story, but the full novel didn't emerge until he was trying to decide who would be the protagonist of Speaker for the Dead, when his wife suggested it could be Ender.
Playing with Character Type: Harrison Ford is known for playing heroic characters, among them Han Solo, a Jerk with a Heart of Gold that was likable. Ford's portrayal of Graff is just the opposite - a cold, calculating figure that isn't concerned for the safety of his cadets so much as he's concerned with overwhelming an alien race.
Stillborn Franchise: Plans were made for a sequel, but due to poor marketing, some odd creative decisions, and possibly the backlash against Orson Scott Card's stance on homosexuality, the film failed at the box office and left any sequels in doubt.
The Shadow books were originally going to be written by different authors, each centering on a different member of Ender's friends.
The Flaming Lips wrote a EP that they suggested as a concept soundtrack for the producers. Only one of the songs made it onto the film (over the end credits).
Word of God: In one interview on National Review, Card says that he was inspired by Bruce Catton's histories of the American Civil War, and that part of the message was that war means sacrificing the innocence of young people for the Greater Good and that it is the duty of the old to make sure their civilization is worth it.