Continuity mistake: In the cornucopia bloodbath, the District 3 girl can be seen lying dead next to Cato when he picks up the water container, yet only moments later you see her in the distance of one shot being killed by a boy tribute (being slashed to the neck).

The Hunger Games (2012)
Trailers
Directed by: Gary Ross
Starring: Woody Harrelson, Donald Sutherland, Elizabeth Banks, Stanley Tucci, Jennifer Lawrence, Josh Hutcherson, Liam Hemsworth, Wes Bentley
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Katniss Everdeen: I volunteer! I volunteer as tribute!
Trivia: This movie has approximately 1200 shots that are composed of CG animation. The director Gary Ross' previous movie, The Tale of Despereaux, was also composed of approximately 1200 CG animated shots. The Tale of Despereaux was a fully CG animated movie, yet the live action Hunger Games had just as many CG shots.
Question: After the end of the 74th Hunger Games, Haymitch and Katniss are having a conversation on a balcony and after Haymitch tells Katniss she showed them up, the camera moves to a wide shot of them and during Katniss' response, something can be seen moving inside of her dress that looks similar to a hand, but both character's hands can be seen resting on the ledge. Do you know what it is? (02:09:36)
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Answer: I watched this scene multiple times on YouTube. There is definitely something moving that probably is not supposed to be seen. I'd agree with your assessment that it looks like a hand. Most likely a film crew member is crouched on the floor performing some technical function during the filming. Just what it is impossible to tell. You should submit it as a "movie mistake."
raywest ★