Keep in mind that literary elements include the various rhetorical devises used by authors to create depth in literature. Some literary elements to identify in any novel include figurative language (metaphors and similes), symbolism, point-of-view, characterization (what are the qualities of different characters and how do they change), irony, imagery, and setting.
As present in the entire Hunger Games trilogy, Catching Fire makes use of several examples of symbolism. One of the best quotes as an example of this is when Katniss says:
The bird, the pin, the song, the berries, the watch, the cracker, the dress that burst into flames. I am the mockingjay. The one that survived despite the Capitol's plans. The symbol of the rebellion (386).
Not only is Katniss herself used as symbolism in the story, each of the objects she mentions above is symbolic in the book. Even the very idea of "Catching Fire" (from the title) represents the idea of revolution, and that Katniss will lead others to "catch" the fire and fight the Capitol.