Sometimes the clues to the puzzle are subtle, and not what you might be expecting. For example, watching a magic show (Penn & Teller: Fool Us), the opening act chose three “random” audience members. Now, we never saw exactly where the sleight of hand occurred (though we have some theories)…but we did notice that she had a microphone transmitter pack, and it was under her clothes. There is no way she could have miced up in the little time between being selected and coming onstage, at least not routing the cable and transmitter under her clothes.
That, boys and girls, is called a plant. Subtle clues, and not at all in the sleight of hand.