The film was originally going to include the character Peeta Mellark, scenes were even filmed with him. But due to the age and time restrictions of the actor who had been chosen (Daniel Jackson) he was cut from the picture completely.
The entire movie was filmed with only one camera.
Shooting for the second part has already wrapped, though art 2 will not be released until July of 2013.
Cat Della Moore (Katniss Everdeen) said her least favorite part of filming was the bow and arrows. The arrows used for filming were not real and actually would not shoot out of the bow, so (sometimes) they would come back and hit her in the face.
All of Megan McCabe's (Primrose Everdeen's) scenes were filmed in one day.