When the movie gets near the end of camp, when Coach Boone (Denzel Washington) is saying, "What are you?" and they say "Mobile, Agile, Hostile" and so on, watch Gerry Bertier (Ryan Hurst). Look at his mouth piece. The first time they show him, the mouthpiece is in his mouth. Then, the next times they show him, the mouth piece isn't in his mouth or even on his face mask.