Originally, Antonio Banderas turned down the part of Pierre when he looked at the script and realized the whole film was about ballroom dancing. The producers begged him for a few minutes for them to explain the story. After hearing this, viewing a documentary on and meeting the real Pierre, Banderas signed on.
Antonio Banderas and Laura Benanti, whom both star in this film together, were previously on Broadway together in the 2003 Revival of Nine the Musical. Banderas received a Tony Award nomination for his role in this production.
In the dance scene with Pierre and Morgan during the detention, they dance Argentine tango, which is not considered a ballroom dance. American and international tango, both ballroom dances, are completely different.
When Augustine follows Pierre outside after the first meeting, there is a green bungee cord visible pulling the door closed. When some students enter the door, the bungee cord is gone.
At the dance competition Dulaine lets Rock borrow his Tux coat. Dulaine is much smaller than Rock however, the coat looks over sized on Rock when he's on the dance floor.