How is it that Vanessa Hudgens doesn't pick up that her captor sounds exactly like Kyle?! She heard him give a lengthy and memorable speech... she's had 1-on-1 conversations with him before... and she has a crush on him!
His voice was never altered when he changed to the beast and others knew it was him by the sound of his voice.
Case in point, at the Halloween party, Kyle catches his girlfriend and best friend hooking up. Over loud music and some distance, he calls out her name. Both of them hear something, stop making out and immediately say, "That sounded like Kyle."
So how does Hudgens not pick up that the Beast clearly sounds like Kyle... again... a man she has the hots for!