Here are a few of the tidbits he picked up:
Changes to the screenplay led to changes in the books.
Fans of the book may be surprised when they see the finished film. Why? Because while the cast and crew strived to stay true to the spirit of the original text, a number of details were changed along the way.
"In the book, [Number Four] knows from page one what he's supposed to do," Caruso told us. "In the movie it takes him quite a while to kind of figure out who he is and what he wants to become. And I think that was what was dramatically and cinematically interesting to me -- who he thinks he is and who he really is are two completely different people. And he has to come to terms with understanding that who he wants to be isn't who he's going to become."
The good news is that if there's a sequel, it's likely to stay much closer to the source material for one simple reason: After reading the script for this movie, the authors will be changing the second book to match.
"It's interesting because [the authors] have just outlined the second book, so some of the stuff that we had in the movie kind of sparked different ideas," Caruso said. "I noticed that their outline for book two had changed a little bit. Which was kind of cool."

