I guess this counts as a prop question... In one of the promos for "Guardian Angels" they showed House snapping a $100 bill open for someone to look at, complete with snapping sound. Except the bill didn't look like any $100 bill I've ever seen. The portrait didn't even look like Benjamin Franklin. (
promo screencap)
But in the episode last night, the $100 looks like a real $100. Hugh looks identical, down to the individual flyaway hairs. (
episode screencap)
So it seems like at least one take (assuming Hugh managed to look exactly the same in two different takes), they used a fake bill. Why bother? It has to be cheaper to get a real $100 instead of digitally altering the shot. Doesn't it? Maybe there's a really really new $100 design I haven't seen yet...