While some people speculate that Jimmy Fallow wears a hairpiece, there is absolutely no proof that he does. However, he definitely wore a hairpiece when poking fun of Justin Bieber in a spoof video they made together last year.
Jimmy Fallon's show may have started off slow, but it's gaining a bigger audience than some of his predecessors. In November 2012, his late night NBC show earned a 13% lead over Craig Ferguson's The Late Late Show. He also has more viewers than the Late Show with David Letterman. Pretty nice for a guy who started out on SNL.