'The X Factor' Top 12: Sarah Hyland's air drums, weird sexy dancers and more of what you missed

A spectacle like "The X Factor" --12 acts performing on live TV with different backup dancers, backup singers, and intricate stage setups in just two hours -- requires a lot of effort to pull together. While the final product that aired on FOX might've looked seamless, there's plenty of work going on behind the scenes that you never see. Here are five things Zap2it observed in the "X Factor" studio that you never caught at home. 1. The Warm-Up Guy. Most live television shows employ a warm-up comedian to tell jokes and get the crowd's energy up before the cameras roll, but "The X Factor" guy takes a different approach and recruits audience volunteers to sing a cappella. It's a recipe for disaster, but luckily three out of four people chosen on Top 12 night were decent singers. The fourth, however, was like a live-action version of a cringeworthy joke audition: a rapper named "Big Stats"...



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