When Edward is on top of the bus, the people riding on tour buses next to him laughing and pointing at him weren't extras, but real tourists.
Idina Menzel, a Broadway veteran and Tony Award winner, does not sing in the movie. In an interview, Menzel stated she felt flattered to be hired solely as an actress.
In the scene where Edward is run over by the cyclists, James Marsden was actually hit by them for real. The cyclists were just meant to "bump" him and he would fake a fall. But Marsden didn't think it looked good, so he insisted on filming the collision for real.
The wedding dress that Giselle (Amy Adams) wore weighed forty-five pounds. A stunt double taught Adams how to move in the dress. She described it as "gruelling" since "the entire weight was on my hips, so occasionally it felt like I was in traction."
Several non-singers made their singing debuts in this movie, including Patrick Dempsey. The only main character who does not sing is Nancy, played by Idina Menzel - who has two Tony award nominations and one win for Broadway musical singing roles.