Cat Della Moore's hair changes from a side traditional brad, to a back twist braid, to not braided at all throughout the movie.
Though District 12 is supposed to be a shabby District, the filming locations for this Appalachian coal mining state, are very nice. Like Katniss's bedroom, the kitchen, and the master bedroom area where Katniss and Prim prepare for the Reaping.
When Katniss's mother is braiding her hair for the Reaping she says, "It's nice what you're doing for Prim." and Katniss replies, "Anything not to have her name in there more than once." Though people who read The Hunger Games novel will know to what they are referring, people watching the movie will not understand this reference to "tessera": a way of getting food for your family by putting your name in the Reaping more times.